Why don't you apply for a job there? Even if they don't have any openings, at least you'll have another excuse to see her.

I know when I apply for a job, I'm very persistent and would check every 3-7 days what's going on. I didn't do that because of a girl, but nobody thought it was weird that I was checking on my potential job so often. What I'm trying to say is, even if you do apply and show up there very often, but do it because of the girl, I don't think that anyone will know that the girl is the reason you are doing it.

Enjoy your life while you are young because I can almost guarantee you that you will regret not taking full advantage of it later.