Itunes
coloring books (yes!) from Dover Books
Amazon gift card (kindle books, gift card)
Is this for a friend of your kid's, or a family relative that you need to order and have it delivered... ? A cookie bouquet?
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ETA:
You really have to know SOMETHING about the child to make a good choice. My daughter is 12, and has very little interest in nails/hair/makeup/friendship bracelets, etc. All the "typical" stuff... she doesn't care about. She loves things like duct tape though. So a box with 5 rolls of various patterns/colors of duck tape would be loved! Or a gift card to a book store (of any kind, BAM, B&N, Amazon) would be an excellent choice since that is what she always is pestering us to buy for her: books. For a kid who doesn't like reading, maybe not such a good choice. This is also the age where they can go to a friend's birthday party and show up with a gift card for movie tickets OR a huge bag of gummy bears (found one at a bookstore once that was the size of a cereal box) or some other "favorite" candy/snack... and have both be equal "hits" with the recipient.
A lot of girls today are not "typical" and have their own sense of what is fun... not some prescribed age appropriate idea. If you know anything about this girl at all, it would help to share it here for the best ideas.
oh and here's a link to the "coloring books" I mentioned above. My daughter loves doing this stuff with colored pencils. http://store.doverpublications.com/0486444619.html
oh.. and yeah.. my 12 year old had about a year when she liked some things from Justice... when she was about 9. And she has never liked dolls of any kind, including American Girl.
Without any information on the girl, you need to go very general (like cash or a Visa Gift card).