can you write your paper now and know when it is due?
if yes, then stop writing her e-mails and wait for her class again, then schedual with her a face to face conference/meeting/whatever and talk about what just happened. if you two keep going back and forth, it is going to cause more problems for you then it is worth. i had about the whole class backing me up for what i believed when i had an issue with a teacher of mine, and guess what, i still got screwed...it doesn't matter that you are right, and you probably are, but how would you feel as a "high, all knowing, and all mighty" college professor with some freshman trying to prove you wrong, it wouldn't work for you, and i doubt it is going to work with her. e-mails aren't too good at protraying emotions, maybe her mother just died or something...just wait till the next class to talk to her anymore
Kelli