(not sure if i'm responding to this too late, if so, tell me how it went)

Just be yourself.. and if you really are nervous about asking her, just talk to her a bit to break that a little.. then slide in the question.. don't say "wanna go out with me sometime?"

just ask her if she'd like to go to the movies/dinner/etc with you...

and well - it doesn't seem like this girl would go for the "wanna fuck?" line soo.. don't do it