Am I in the wrong?

So, I(19) had moved to where my mom lives now because I became homeless after she left where she used to live. I moved into her place because I was pregnant (38 weeks) and was told that I didn’t need to worry about anything but taking care of my baby. There is a total of 8 people living here: my mom, her husband, my sister(21), her boyfriend, my brothers, and my and my baby.

My sister tested positive for covid, but walks around the house without a mask on and comes a step or two close to my baby.

Today, my mom works late and didn’t come up with anything for dinner, so my sister decided on dinner for tonight and went to her room after getting the stuff together. My baby was showing signs of tiredness, so I went to my room to feed him and put him to sleep.

As my baby was about to sleep, my sister kept knocking on my door asking me when I was going to make dinner, and I told her that I need to put my baby to sleep.

I get a text from my mom asking me to make dinner, then saying never mind, then asking me again.

My sister knocks on my door and shouts through the door telling me that my brother is hungry and I need to make dinner. She asks me why I’m putting my baby to sleep.

Baby schedule from 8:00pm:

8:00-9:00pm last nap

9:30pm: bath

10:00pm: cuddles, eat, sleep

She opens my door and says that my baby doesn’t need a nap because he goes to sleep at 9 (is actually 10), and he doesn’t need a bath because he took one yesterday. She also said that I need to contribute to this household and I need to make dinner because everyone is hungry.

I tel her that my baby comes first and she says “who told you to have a baby?”

My baby (who is obviously still awake) starts crying so I start to get upset and angry.

I then said “why don’t you make dinner?” And she yelled at me saying “because I have f***ing covid!” And slammed my door, then went to her room slamming her door.

It’s now about an hour later, baby still not asleep, and she’s banging on my door asking me if I’m making dinner. And now they’re yelling at me that nobody wanted me up here when though my mom was the one who came to get me.

Am I in the wrong for not making dinner? Am I in the wrong for telling her to make dinner even though she has covid? What do I do?