Sounds to me like she has mental health issues to deal with currently..... with that being said just try to be there for this person, they probably need it. Definitely a cross road for you guys. This may go on for a long time. You have a decision to make
Lol, don't know why you got a female best friend , but not my place to judge. Anyways when it comes to wmen you trust their actions never their words. Consider it a lesson learned.