I'm going to cut off a former friend and advise my friends to do the same.
Why do you have to cut this friend off?
She started to act weird. So I had my friend tell her to GTFO of my life.
It's difficult to feel like you're moving on from a close friend, but sometimes those things do happen. However, you're going to upset a lot of people if you're caught talking negatively about people behind their backs as that sort of gossip is typically looked down on.
She's a bitch, she deserves it.
If she's not your friend anymore you should leave her alone. If you pressure your friends to cut her out of their life also, they might start resenting you and you'll lose them too.