So my best best friend turned on me and she hated me because some girls just came and brained washed her!:(
And she went to another city for one whole year! And now she came back yeah.. I miss her I want to be her best friend again but you know that girls who brained washed her yeah there nothing like her and there still best friends and it's really killing me because I can seriously relate to her! And they all regret it what they did to me they made me do bad stuff and I really didn't enjoy my life that time.. Anyway so please I need your help guyss! I want to be her best friend again!:( HELP?

Move on... start fresh.. she prob come looking for you to find out why you gave up.. By then you'll have new best friends and she'll be in your position.. it can be hard to give up sometimes... Just keep busy.. it'll pass.

Sorry but this is how friendships normally happen. You can not move back to how things was, she changed and you even changed also. Move on with new friends and let it go

You have to figure out what exactly has changed her. If worst comes to worst just ask her why she doesn't like you. She'll either not have and answer or she'll start blurting out a bunch of false facts about you. At that point you should just remind her of a fun time y'all had together then depart from her with some closing words and don't let her reply. Just walk.
Hoped this helped :) :) :)