I hope she isn't suicidal because it's entirely possible that she could be pushing you away so she can off herself. It is also possible that those medicines could be altering her judgement because many medicines cause people to do seemingly irrational things.

Regardless of the reasons behind her behavior, I would confront her. I would go over to her house and refuse to leave until she gave me an explanation. Either she is at risk to herself or she is being incredibly selfish. You deserve answers and if she is a threat to herself, she may need your help.