Just go up to her and say this:
"Hey, you seem like a pretty cool person.
Would you mind if I get your number so we can chat sometime?"
If she says yes, (enthusiastically) that means she is into you.. (as a friend)
If you manage to text with her for a while, and you guys talk alot, ask her to see a movie with you sometime.
If she says yes, you go'n get some.