The Hilda series by Luke Pearson is really great. I think Hilda and the Troll is the first one, but I don't think they necessarily need to be read in order.
Sisters, it's the companion book to Smile (so either or both). These are graphic novels for girls, I work in publishing and they are INSANELY popular for this age range - $7
Marvel comics:
Other recommendations:
Additional resources:
EDIT: removed IDW's Transformers
The Hilda series by Luke Pearson is really great. I think Hilda and the Troll is the first one, but I don't think they necessarily need to be read in order.
Also, all the Raina Telgemeier. She has Smile, Sisters, Drama, and Ghosts, as well as graphic novel versions of the Babysitter's Club books that are fantastic. And Roller Girl by Victoria Jamieson.
Everything, everything, everything Frozen.
I second the suggestion for art supplies and books. Put it together and go for a doodle book, a kind of middle grade coloring book.
Some great cheap ideas that you can package all together (the more gifts for a little girl, the better)
Hope this helps!