Whats going on with my 'friend!!' please help!!?

It sounds like shes jealous of you and jamie's friendship and is feeling really insecure. You should talk to her and ask her what is up with her...she is obviously confused. If she refuses to talk to you about what the problem is, you should just ignore her. Even if she starts acting nice again....she shouldn't hit you and she can't expect you to talk to her like a friend after all shes done to you guys.