Hahahaha okay thats funny. I think that was her way of telling you to stop. Don't push too much or you will lose her. I say that it is more than possible that she is a virgin or she may have had a bad experience in the past that is making her back off. While it could be a test to see how committed you are, girls have needs to so it is probably just to soon for her. You need to see if she is waiting for marriage or not. The chick sounds pretty old school.