Most Helpful Girl
It seems to me that the biggest issue here is lack of communication. Did you ever tell her you have real feelings for her and you want something serious? If you didn't, it's time to do it; and make sure the argument you had left no resentments, so talk it through again if you need to and apologize if you have to. So basically, open the game to her. At this point, you have nothing to lose because if you don't react, she'll be gone; but if you do, there's a chance things will turn around. So go for it, speak your mind to her. I hope she feels the same! Good luck.