I'm just asking out of curiousity, I'm most likely going to keep this to myself anyway.
Most Helpful Girl
Unless you're planning on taking things further in your relationship, which you're not, I would highly suggest not mentioning this to her at all. Although it is flattering, it can also be taken the wrong way... you may come off as someone who can't control their feelings like that which would make you look unattractive to her. Also, this could lead to you two conversing more about sexual feelings which would not be good for either of you if you are trying to stay away from sex. Talking about this can easily lead into temptation. The best thing you can do for your relationship with her is to keep this to yourself. It's just the respectable thing to do. And I think that's how she sees you so you should keep it that way.