In the UK, this sort of harassment and discrimination is technically illegal, and people do get done for it, though I'm sure a lot get away with it too. I suspect the situation is the same in the US so I would urge you to keep gathering evidence and getting legal advice, if you want or really do need to stay in this job.

The more I hear about this though, the more I think you should question whether you do really need to stay there. It sounds like a totally toxic situation which will leave you far too stressed to get much healing done. Is it a case of really needing the money to live, or are there any other options like living off a partner for a while or moving in with a relative? Not ideal but better than what sounds like a bit of nightmare you're dealing with at the moment.

It's not right that you have to make that choice but your first priority needs to be getting yourself better. Don't feel that you have to stay there in order to 'beat' this foul woman - if she's working 100 hours a week and treating people in this way then she's obviously already so full of greed, anger and unfulfilled ambition that she's probably at least as unhappy as you are. It's important to spend as little time around such people as possible, in my experience.