It is really hard to say what kind of person she is, what she is thinking and what she´s feeling since I know so little about her, but she seems to be a bit confused. She could have dumped you in a more human way but it's never easy to dump someone and the person being dumped is always hurt in some way.
You both are very young and you have so much to look forward to in the future. That might not be any painkiller right now but you should try to concentrate on other things. A very good thing is to practice running or other sports. Focus on things that you like in life and try to be with people that give you energy and makes you glad.
I think you should just leave her alone and go on with your life. Maybe you should take a break with relationships and just heal yourself until you are ready to attend to a new relation.
