How to back at a friend that acts like a witch?

Well yeah i have a friend like that too. She thinks she is all that. But she isn't she is just a snob. Well i am trying not to be her friend. And my other friend is sick of her too. So we decided we are going to make new friends with each other and stuff. And make those friends hate the girl. Well also when i make new friends she steels them from me i get really angry then. Just try to do what i do.