If she likes to read, a Kindle or a Nook would be a great gift for any tween or teen girl. Ask family members to gift
Amazon or Barnes and Noble gift cards and she can buy several books to last the year.
Music is always nice - does she have an MP3 player? An iPod is a great gift - and again, family members can gift iTunes cards.
Magazine subscriptions are fun - I don't know what's popular with her age group but the librarian at her school would know.
Traditional books - my daughter always has a stack under the tree!
Makeup - especially from Sephora. If she isn't wearing "real" makeup yet, then specialty skin products like soap or lotion. Body wash, bath gel, scented soaps, etc. Special tools - makeup brushes, eyelash curler, etc. Bath & Body Works is also a great place to find gift sets.
A good quality hair straightener - we swear by the CHI brand. New brushes and combs, or hair accessories.
Tooth whitening strips- my girls used the Crest whitening strips and loved getting them in their stockings.
And I have to add: I know it is hard to spend a significant amount of money on UGGs or special jeans, but honestly I would hate to have deprived myself of seeing the joy on my daughter's face when she got her first pair of UGGs and nice jeans as Christmas gifts. Yes, she outgrew them after a year or so, but I think Christmas is about fulfilling some of those dreams and I wouldn't have missed that for the world. She was so thrilled - that was worth having to buy another pair the next year. Just my opinion...