I think my friend is in a toxic relationship! how do i get her out?

I know it'll be hard but if you get a chance to talk to her I don't recommend insulting her boyfriend. You need to find a way to get back in her and right now the only people she is seeing are approved by her boyfriend. Once you slowly build a relationship with her (I recommend trying to spend some time with them as a couple because it he means a lot to her) you should talk about a "friend" of yours who is in a bad relationship. Don't make it obvious you've made this person, let her see the commonalities by herself with your "friend". This way she remains a friend with you, she gets the message and the boyfriend doesn't put you on his disapproval list. I know its passive but it might help. Good luck!