I guess it depends what's she's into, most at that age I'd say is makeup or jewelry but when I was that age I wouldn't have thanked you for it
What about making up a little hamper for her, favourite snacks, drinks, little bath set, candles, or even doing a "movie night in" getting popcorn, candy, a dvd, comfy blacket, some drinks etc
There also cinemas that do a gift set where you get a film for two, popcorn an a drink for two as well