I think I know what you are talking about, and I understand how this is not a crush.
When I was a freshman in HS, there was a sophomore named Aimee. She was beautiful, popular, on the dance team (which was bigger than cheering at our HS)and destined to be the homecoming queen her senior year (which she was).
We wound up getting to know each other through soccer, she played on the same team as my boyfriend (I was the team's score-keeper, so got to travel w/ them). I sooooo looked up to this girl! I felt the same way you do, kind of awed, and I REALLY wanted her to be my friend, 'cause lets face it, if she was my friend, man I was COOL! <img src="/images/graemlins/cool.gif" alt="" /> I think that's what you are trying to say about this girl at basketball camp. And no wonder, this Senior in HS, that's pretty, I'm assuming good at B'ball, took an interest in you a freshman; that had to make you feel good!
If she gave you her address, go ahead, write her a letter, let her know you admire her (tone it down a little bit, though). In sororities in college we have Big sis/little sis, this sounds like a perfect type of relationship for you guys! With her as your "mentor" in basketball, high school, boys <img src="/images/graemlins/wink.gif" alt="" />, whatever. Trust me, people always like feeling needed! <img src="/images/graemlins/heart.gif" alt="" />