My friend is totally preferring some ugly mean violent girl over me and I don't know ho to make her stop wanting to hang out with her so badly

Unfortunetly, some people want different things in life than we do. Is this a more popular girl? Sometimes we do things to fit in with a certain group a people to be more widely accepted. Have you tried to hang out with her an this other girl? Maybe there is more to her than what you are seeing. I hope that things work out well for you and your friend!

I would give her some space for awhile. The last thing she's going to want is you ollowing her around. If she starts getting more distant, try gettung to know her new friend more.. she might not be as mean as you think.
Good luk and hope this helps!