There are quite a number of things that you can choose from as a birthday present for a 17 year old girl. Some ideas include tickets to see her favorite band, gift vouchers, iPod, a handbag or cushions for her bed. Get some more ideas from http://www.squidoo.com/best-gifts-for-17-year-old-girls.
at 17,no way! a gift certificate at her favorite store is the way to go. or tickets if a concert she'd love is going to come within the next month. otherwise she can choose her own clothes,makeup,shoes,handbags. remember how you were at that age? gift certificate. good luck