Let me see...you say she's interested in you, and yet she avoids you. Hmmm. So how exactly do you 'know' that she really is? Actions speak louder than words, especially when it comes to female actions. And her actions say she's not interested. I mean, even if she said, point-blank, that she was interested, and she ignored you, then you would know she was messing with you. To become infatuated with her would be a mistake. What you're doing right now is even worse. You're becoming obsessed, and you haven't even picked up any signs that she's interested in you.
So, yeah. Back off and forget it, hopefully find somebody you have a better chance with. Read the DJ Bible thoroughly, and lose the insecurities. They won't get you what you want.