Advice on babysitting

Dakota • TTC baby one since November 2014
It may be a little long. 
I work for a teacher. She has a 7 year old and an 11 month old. At first, I'd show up to her house, grab the baby, and go on with my day. She didn't want her to go outside or literally be put down at all. This baby is so spoiled. If she cries, her mom asks if I'm sure I can handle her. BABIES CRY SOMETIMES. I'm 21, TTC #1 but I've been around babies my whole life. 
Two months pass, and she asks me to start getting the 7 year old up and ready for school(while she's home) and off to the bus. Then, one day, everybody is gone, and she calls and says that she and the baby has thrush. Which is a yeast infection. Which is contagious. WELL THANKS FOR ASKING IF IM OKAY WITH THAT. I was literally so angry. 
So a few weeks later, she asks me to start cleaning her house(which is horrendously disgusting) and she'd pay me extra. That's fine. I'm okay with that. I vacuumed, did dishes, swept and mopped, dusted.. Etc. for a whole week. I didn't get an extra cent. And she's been calling me on weekends because she can't clean with the kids home. Yet she expects me to. I have to be here by 6:45am every morning. If she stays home, she doesn't tell me until like 11pm the night before when I'm already in bed. This morning I showed up and she said she didn't want me here until 9. So I went home for two hours. I have to clean everything the baby touches before she can have it. She can't be on carpet at all or her mom loses her shit. Her mom literally calls me if she can't get the baby to sleep because apparently I have the magic touch. I feed the 7 year old. I make her clean her room and everything. I'm the mother here. She told me she could never be a stay at home mom. It's awful. So many people want to to quit but I love the baby. She's had some awful sitters and I don't want that to happen again. After this school year I'm moving but I don't know if I can make it that long. Advice? 😰