How do I get over her? (long question)?

Time heals all wounds. What you need to do is stop thinking about her to the best of your ability. Minimize all your contact with her. What would probably help a lot would be if you found a girl to think about while you forget about this one. Personally I suggest one that seems more receptive to your advances though that might be hard to do. The main point find something else focus on other than her whether it be another girl or some other topic.