It could be a mood swing, or you reminding her of somebody, or a million other things.
If it surprised your coworker, who’s been there for a bit- that sounds like something that doesn’t happen too often. Ignore for now (the way they ignore your mistakes while you’re starting a new environment) and keep up what you’re doing. Adjustments can be tough for both sides. 😊

As you learn what her priorities are of the night shift do them first to get them out of the way. Do ALL the tasks assigned to you, nothing more. At no time should you expect a fellow employee to come in on their day off to follow up of you doing your job.

If the number of tasks are too numerous for you to do in the allowed work shift make her aware. This should give you a way to find out which of those things are of minimal priority.

"I'm glad you noticed that. Thank you for bringing that to my attention. How are you tonight?"

"I'm glad you noticed that. Thank you for bringing that to my attention. How are you tonight?"

"I'm glad you noticed that. Thank you for bringing that to my attention. How are you tonight?"

"I'm glad you noticed that. Thank you for bringing that to my attention. How are you tonight?"

"I'm glad you noticed that. Thank you for bringing that to my attention. How are you tonight?"

"I'm glad you noticed that. Thank you for bringing that to my attention. How are you tonight?"

"I'm glad you noticed that. Thank you for bringing that to my attention. How are you tonight?"

I'm not sure this will help you in any way but here goes nothing.
In my previous job I was a manager in a small company. 30 employees, most of them young people with no previous experience. I was telling my boss I needed help in the office. One day he hired this guy to assist me, who previously worked as a manager in another company. His company closed and he had to start over. He was older than me. I thought it was a good idea, I wouldn't have to teach him and he could be more helpful than someone inexperienced. I was wrong. He'd learnt to do things differently, and he acted like he was still a manager. He even proceeded to correct other employees. I didn't like him. I always treated the other employees as if we were equal, but they all listened to me and never questioned anything. He had this attitude as if he wouldn't acknowledge me as his supervisor. I felt threatened. What if our boss was preparing him for a second manager? What would happen if we had to work together 12 hours/day? If I had to work with another person, it would have to be someone I get along with, someone I knew would do things properly even if I wasn't there, someone I could trust that he'd listen to me. And he wasn't that guy. When I saw him doing things differently, I'd get annoyed (but it never bothered me when other employees did something wrong). He'd say "we did things this way in my work". Well, I don't care what you did there! There was a reason your company closed! I needed to see in his eyes that he trusted me and listened to me, but it just never happened. He didn't stay for too long. Ever since I was sceptical when we had to hire someone. I never again wanted to hear "he knows the job". Preferred to hire someone inexperienced and teach him.

Keep your head down and fly under the radar. Don't over think this as it's going to get a little interesting. Your boss is pushing the performance bar and you don't want to be the example. Avoid without being detected.

Remember, she is responsible for what goes on during that shift. If something is forgotten, it will have an impact and she will get the blame. Therefore she has to make sure all the "i's" are dotted and all the "T's" are crossed. Same for any boss.

Come up with a checklist for all of the required tasks and checks and tick them off at work to make sure all bases are covered.

Show her the checklist. She may adopt it for the whole department.

That is how you get into management--systematize, and streamline when you can!

Or things going on in her private life...

I once worked in an office where women outnumbered men three to one. The boss was a woman. Whenever one of the women went on a date and told about it, the boss would get jealous--because nobody dated her (poor woman!).

It could just be your personalities clash. Some people just make me smile and others could do the same thing and I want to spit in their face. No rhyme or reason to it. I think it has something to do with that energy vortex jebus is always talking about.

It eases the boss's mind when he or she becomes convinced that YOU also have the best interests of the enterprise at heart, when your loyalty to the boss and the enterprise are assured . . . when the boss is convinced that you are someone who cares and can be counted on--and are not just somebody looking for a paycheck.

I would offer some observations, based on decades of being in "management" positions.

When I said that some people are just looking for a paycheck, I meant that they are simply wanting to get paid by doing just the minimum. If people are desirous of entering management, they have to treat the enterprise as if it were their very own, even if they are just a low-level employee.

Take the employee who walks by things that are broken or just not working well, and just keeps on walking. Take another who reports things that are broken or just not working well, and perhaps as a bonus, comes up with solutions to fix things and make things run better. If you were the boss, which one of these would you select for a management position?

We are constantly having to prove ourselves. Every day is a new challenge. No one is so accomplished that he or she can afford to rest on his or her "laurels." I have seen, time and again, people in organizations who feel that they have contributed all they need to, and they just slack off. I have seen those same people go out the door with a little push.

Credentials are great, but attitude is 99%. The most important thing is motivation. I have seen people with credentials coming out their ears who just lost their get up and go. Truth be told, most employers do not care if your knowledge is especially broad. They want you to be able to perform specific functions exceedingly well.

To get a substantial promotion, you have to convince the powers that be that you are wanting that promotion so you can make a greater contribution--and not because you just want a bigger paycheck.

Once an employer is convinced that you have his or her back, magical things start to happen. If they don't, it's time to find another employer who appreciates a person with your motivation.

I guess I don't want it that bad. I can responsibly enter management if I want to and there is nothing wrong with my work. I am the guy that has been going above and beyond imo and if it's not enough then it's a bad fit. I guess it boils down to that.

I can get hired into any entry level position I want and eat ****shit if I felt like it. I'm at the point of suspecting they're making ****shit ****shit up. I'm just really sick of people in general and maybe I shouldn't be in the service industry at all. Thanks for helping me realize that!

The service industry, quite frankly, sucks. Forget holidays, evenings with your family, or two days off in a row.

Yes, if a person has been going above and beyond, and it's not getting noticed, it's time to do one of two things: (1) start tooting your own horn a lot more (whoever works his or her fanny off and doesn't let management know about it is what's known as a chump), or (2) look for another job.

A survey firm did some research some years ago. It was found that for most workers to get a substantial promotion, they had to change employers. Think about that for a while. Let that sink in.

Organizations tend to pigeonhole their employees, i.e., to categorize them in such a way that they do not see their full potential. Some employees do move up in the organization they joined--but the majority don't.

Try blowing your own horn just a bit. Make sure it's known what you've accomplished. If that doesn't do the trick, start looking elsewhere!