Having worked with these types of unethical professors I urge you to contact a few of your classmates, determine how their papers were graded and, if there are discrepancies, (and I suspect there will be) advise the professor of your suspicions and your intent to complain about her unethical conduct. Then compose a letter with the issue, send a copy to her Department Chair, the Dean and the NRA (with them listed as a recipient). If she doesn't change the grade you've lost nothing and allowed her to see what a reallly good composition is all about. DON'T let her off the hook. They do this stuff because they can and they get away with it.