This is absolutely wrong. You need authority figures or violence unless you have the option of changing schools. She doesn't care what you think or what you say. "I'm rubber, you're glue" doesn't work on this type. This has moved beyond simple name calling and into assault.
What you need to do is keep very explicit documentation, and get your parents and whatever authority figures you can in on this. Note the days, times, what happened at the incident, what was said and by whom, witnesses, their contact information, anything that may be pertinent to the occurrence, and photographs of whatever injuries she's inflicted. Try to remember with as much accuracy as possible some of the earlier events that took place before taking these notes, and record those as well. Keep this information in a binder, notebook, or text file on your computer in a safe place, and never bring it to school unless it's a copy or print out to show to the administration - if this bully sees it, she'll destroy it and make your life even worse for it. You may also want to look into a lawyer.
Also, tell the administration of your school exactly what's happened and how long it's been going on (and maybe that you have a lawyer - this should get them jumping). Show them whatever notes of the incidents you have written down, and also make note of when you talk to the administration (meaning principal, dean of students, someone in charge, what have you), to whom you spoke, dates, times, what you both said, etc. Make sure they understand that you're keeping very extensive records of what's going on, and that you're writing down everything they say. It would be best to have this conversation with the principal, because s/he's the one who has to deal with the superintendent and bad press. Your parents should probably be with you to back you up and offer support.
You should also record exactly how this bullying has affected your day to day life (cannot attend cheer practice, afraid of walking in the halls, cannot wear skirts, afraid of physical assault, &c.). What you're doing here is building a case and putting pressure on the administration to do something about this problem. If nothing improves or she beats you up or makes you pass out again, slap the b*#ch with assault charges and get her taken care of. This is where a lawyer would come in handy, because I'm not sure how this works with minors. Don't mention your notes to the bully as a threat. You need to keep your cards hidden until the last moment, or until you really need them.
And I'm going to be honest here: she bullies you because she can and you let her. Don't be afraid to draw blood. I would much rather my daughter draw blood from a bully and get suspended for a week (or be injured herself) than know she's letting all this come down on her without a fight. If you do end up fighting her, record the fight in your notes with all honesty about the physical damage you inflicted on her (and her on you, accompanied by photos), and how it all started. The consistency, accuracy, and details included in your record up to that date will indicate to the administration and the court (if it gets that far) that you aren't the one starting crap, and were in fact fighting in self defense. Your parents should be able to back you up on this one, and when they come to pick you up from the office, make sure they know to bring a fresh copy of your records. And then take notes on how the administration handled it.
Good luck.