Did my employer retaliate against me or is this considered retaliation?

I have screenshots of every conversation my employer and I have had. It started with a message about the schedule I wanted to leave earlier for school. Out of fear she would say no, I told a white lie saying it was a mandatory class. I’m in online school but I’m trying to find a good school and work balance for I had been falling behind in my school. After the conversation, the message I sent to the assistant about me staying home with my partner who was really sick, was screen shotted and sent to me. I think it was an accident because after my schedule message I was told to stay home for 10 days due to the covid-policy. I was told I could return to work the 25th then I was put on call. Actually my name wasn’t even on the schedule like the other girls and still isn’t. Then I was asked to have a meeting I said I can come in that fallowing Monday and was ignored when I asked what time the meeting was. Tuesday I got sick with a fever and couldn’t go in due to their policy, my employer asked me to come in tomorrow and wants me to bring a doctors note clearing me for work. She’s says I’m not being respectful and unreliable and she accepts my resignation if I don’t bring the note.