The title of your thread is, "Are We Really True Friends?" If she's treating you like you describe, she has a problem. It is never right to abuse someone like she's doing to you. No true friend would ever act like this.

She hits you, slaps you, makes fun of you, kicks you, and cheats off your school work. You need to get away from her. All the friendships in the world are not worth enduring this torture. Most importantly, you need to report her to school authorities. This behavior is inexcusable. If you continue to allow yourself to be treated this way, eventually, others will pick up on it and start treating you the same way.

Right now, you need to stop hitting her back also. That's only bringing you to her level. Find some friends that treat you like a friend should treat you. Good luck.