Tell an adult you trust about it. If she's bullying you, then she's not really a friend. True friends don't act like that. Be cautious in your friendship with her. If she does it constantly, it might be time to end the friendship. If it's just a one time thing, you can talk things over with her and try to get something worked out.
Rust me u don't wanna fight her the school that I go to there are a lot of fights and it is never good but u also don't wanna tell an adult because then she has more reasons to bully you what I would do is don't get mad just let her eventually she will see you don't care and she will get tired of bullying you trust me :)
Blow her off start hanging out with other friends so she can start thinking what she did wrong and when she asked u what she did then tell her that u couldn't handle her bullying u anymore because true friends don't harm other friends in any ways