Originally Posted by GB
Does she have an iPod? If so, a gift certificate to iTunes so she can pick her own music.
The new advantage of iTunes is you don't have to have an iPod to use the gift cards. You can just download music to your PC and have it available if you ever get an iPod. I would go for that. Getting her nothing will cause more drama than you want on Christmas day (I should know, I have a 16 year old daughter ~ you have my sympathy).
You really can't go wrong with a teenage girl and a gift certificate. If she wears make up, and there's one close, give her a Sephora gift certificate (also works through their website). My daughter would die for one of those. Claires is another option if she wears jewelry (they have funky stuff). Or just get a certificate to the mall, although she probably hates the mall. If she's got a car, get her a gas card. Everyone can use one of those these days.
With the limited intel, it's hard to fully help in this situation.