If you think she is a threat to herself or others try to convince her to go to the hospital....If not that try to get her to go to a psychiatrist for an assessment, but it would be good for you if you were to convince her to let you stay there with her so you can tell the doctor what is going on with her. Or just ask to talk to him if not.

Basically what I'm trying to say is this is bigger than what you can give her and she needs professional help. Her diagnosis could be a couple of things, but she does fit a lot of the criteria. Unfortunately only a professional can tell you that.

Good luck and take care.