18 year old female-friend DRAMA. Please read on...Help?

I would find someone else she is close to that is a friend. and tell them what they are doing and then both of you go to her and talk. dont go shooting your mouth at her or punching her or something. one of my friends was doing the same think kinda and so i went to one of my and hers closest friends and told him bout it and both of us talk to her and shess doing better now