I would take, whatever measures you possibly can, to relocate and just cut off all contact to her. At 22 years old, I recognize, that though past the legal age of 18, there's still that bond to parents, at this age, when one has been in college. Offering to pay off roommates to send you back home, that sound like a most horrible, experience
It's concerning to have family members, in life, that think nothing of contacting your personal medical doctors and spew forth junk at the mouth, about you and their 'concern' for you, especially when it can be a form of trying to control you. I fully appreciate, unfortunately, what it's like to have concern family members make calls like that. It's really hard to trust your doctors, when it's known that although your doctors cannot discuss your file with them, but they are hearing these things, and the trust issue is because deep down, you are wondering(well at least I have), what their perception is of you.

I wonder, if there is a way, to ask, that not only, your file not be discussed, but if you can request, that she not be allowed to voice concern for you?