What do I do or how do I tell her? Please help me.?

I honestly think you should just up tell her; I don't mean just randomly blurt it out, but tell her how you feel. When the right time comes or when the feeling is right, just look into her eyes and tell her you love her and why, remember all the good times you two had. You'll feel so much better, and she may even admit her possible feelings. As a girl, I can honestly say that I like it when guys are straight up with me. Not only does it show how he truly feels, it shows confidence :) Good luck!