Play the nice and helpfull guy

Try to stand close to her, but not too close. And when you see that she is bottered by all kind of guys that don't seem to appeal to her. And they keep on bottering, just go straight to her and tell her that if they are bottering too much, she can come and stand closer to you (and your friends) as being "part of the gang". Turn around again and in no time you'll be talking to a nice and curious girl.