How can I win someone I want?

there is this beautifully gorgeous young woman I am very interested in and I tell her I support her and respect everything she says. she gives me “the look” like an explosion in my brain. she is so amazing but she says she is straight. but yet that look, its like something in the bottom of my stomach just boils up to my throat and all I can do is stare into her imense beauty. I dont know what to do. her body language says to me she wants me but she voices another. she will look at me and when I turn to look at her she puts her head down and acts like she wasnt looking at me. its just the way she acts. when I talk to her, its like her eyes shine something else than what she is saying. but I dont understand why. why does she act like this but make it a point to mention in conversation she is straight, naturally not dwelling on it just passing over the topic but yet everything her body shows is completly different. she is beautiful. her eyes pump through every nerve in my body. when I make eye contact with her its like nothing in this world can go wrong. I am very sensitive and just want to know if I should try… and how to aproach her about it… and yes we know each other, but I dont want to lose something we might have by opening my mouth, should I let it ride? or hop on it? see im torn. I dont want to say anything that could harm the friedship we have.