I'm thinking of not leaving with my fiance after she got kicked out of my best friends birthday party
Why wouldn't you leave with your fiance? It sounds like they need you.
She's a control freak, she would go on a rampage if I don't leave with her.
It was rude for your girlfriend to be kicked out of your friend's party. That said, you probably should leave with her so she isn't alone.
I'm hoping this will cause a fight, then I can show her how wrong she is.
If this turns into a fight it'll be harder to talk to her. Instead try to bring this issue up to her when she is calm so that you can have a rational discussion. She might be more willing to listen to your side and be open minded.