Friend issues, I need advice?

Honestly your young you are going to make so many friends and look back at this and realize people who act like that are no good for you. Don't worry yourself with their immaturity. I know you miss you friend and you want to protect her but she will find out soon enough that she has a bad friend. Just move on get new friends and Im sure she will come around. And if she doesn't then she isn't worth it.