Hey anon, I’m so sorry you have to go through that. Threatening to kick you out is abuse, by itself, and you don’t deserve that. My parents did the same thing to me. I don’t know how old you are, but if you’re old enough to start thinking about moving out, you definitely should.
If you’re not old enough to start making plans to move out, what you should do is talk to a friend’s parents or to a teacher about the situation. They may be able to help you.
I also advocate calling her bluff and calling the cops any time you can. Will it suck in the short term? Yes. But it will be much better in the long term to have a documented record of her abuse.