Talk to the teacher one on one. Don't be defensive, don't accuse her of grading unfairly, just very calmly ask her to explain your grade to you. Whatever you do, don't challenge her about it in front of the rest of class, that will just really piss her off. Good luck. I can't say for the teacher you've mentioned because I don't know that individual, but most of the time, teachers are willing to talk if you go about it the correct way. Good luck!