Hi Girlofmanyfaces, definitely go to a authority at school, someone who will do something about this, perhaps the principle. Bullying is a big deal now and will not be put up with, if they know about it. If she continues after that, go back again and complain until something is done. Come here and talk to us about it.
The people who believe her arn't really your friends, most people see though this kind of behavior. So don't worry, she cant hurt you.
I got bullied a lot in my life. Then I started to take up for myself more, by going to someone and telling.