I think you should get her any of the Harry Potter books. You can also get her books like Walk Two Moons, The Two Princesses of Bamarre, Chronicles of Narnia, Things Not Seen, Hitler's Daughter and Freak the Mighty.
Well, it really depends on what she's interested in. If she likes some funny stuff with myth thingy's (kind of fantasy) you could get her stuff by Rick Riordan, like the Kane chronicles or heroes of olympus. and there's the hunge games, people even younger than that got hooked on it.
Uh, im not sure about Harry potter becuz when I was 11 I HATED it. Too boeing, words too small, and BRITAN talk. No offense, really!! So id get books from the candy apple book series or poison apple book!! I used to LOVE THEM! Hunger games is good too but if shes sensitive, I suggest you to not....it's blooodyy :/
Get her the hunger games, They Cage the animals at night, Roll of thunder hear me cry, hatchet, bridge to terabithia, diary of a wimpy kid get her those, get her romana and beezus books. THOSE ARE AMAZING AND ALL SUPER GOOD BOOKS I HATE READING BUT THOSE ARE AMAZING THEY HAVE AWARDS ON SOME OF THEM SHELL LOVE THEM TRUST ME.