Tell her to give you a specific list of what is wrong with it, and what you should do for it to be up to her stupidly high standards. If she refuses, speak with the Dean, Principal, Student Counselor, or someone else that works in mediating between students and teachers. It sounds less like she has a legitimate reason for making you rewrite it so many times (instead of giving you one chance like she- presumably- did with your classmates and giving you whatever grade it came out to) and more that she's decided she doesn't like you and is trying to delay you until you are behind in the class. That, or- if it is handwritten- she can't read it and is too much of a coward to admit it, too stupid to come up with the idea to let you type it, too uncreative to come up with the idea of having you read it to her, and too lazy to get help deciphering it. Which, as a person with dysgraphia, I was always the last one finished with written essays, and almost always got forced to rewrite them at least once, as if it would somehow improve my handwriting- so I have a great deal of empathy for you if that is the case.