Just ask any girl - we all just love exactly the same things. We only look different so you can tell us apart.
Sorry to be such a smart arse, but you haven't given us anything to go on. What are her interests, her age, anything.....
How about you do something nice that she can remember rather than just material stuff. One of the best gifts I ever received was a surprise helicopter ride over Tokyo.
The important thing with gifts (for anybody) is that you make an effort and think about something that is going to be personally appealing for the receiver.