It's a sad fact of life, sometimes you like someone more then they do you. If you sit around and play the "guessing game" she will occupy more time in your mind then she should. I would say ask her if you did something to offend her, but I'm sure you have in the many messages you have been sending. The best thing to do when anyone, be it girlfriend or boyfriend, stops responding to you is to move on. Relationships are funny things. Sometimes they can be brief when we are looking for more but you have to accept the natural flow of everything to maintain the balance in your life. Maybe she was point in your life to learn something, maybe you were supposed to learn something from her.  Take the best with you and move on gracefully. Perhaps if you stop pursueing her, she'll get back in touch. Then you can decide if you want to continue getting to know her. Whatever the case, try to learn to live your life with the acceptance that change is inevidable. Some good, some bad, but change none the less. Good luck with school.