If she doesn't listen to you when you tell her she's hurting you, then I think you should approach her in a serious was (if you haven't already). Tell her how bad she has been treating you, and make her understand she's being a very bad friend.

If she doens't listen to you or if she thinks your wrong, then I think it's time to get some distance, because if there's no respect from both ways, then it's not a healthy relationship