depends on how much you are willing to pay.
teenage girls love any cosmetics, or bath products (anything to pamper themselves)
also iPods, mp3 players, digital cameras, so on.
most of the time it also depends on the girl herself. like what are her interests?
If she is into art then perhaps get her some new paints. if she likes music, then get her a CD or a giftcard to a music store.
usually girls LOVE clothes and shopping, so if you dont want the trouble of picking out a gift, then get her a gift card to her favorite store or to the mall.
Good Luck.
