I'm going to be a bitch to a girl who friend zoned my best friend and stole the boyfriend of another friend
Why did this girl do all that?
I don't know, but I hate her for it.
I can understand why you're angry with her, but acting rudely toward her isn't going to help your friends. I think you should just ignore this girl because she doesn't sound like someone you would want to be around anyway.
I can't ignore it. I'm going to make her life hell.
Even if you are angry, being rude to her isn't going to help things. If anything, it will needlessly escalate the situation. You should just move on.