That is just one book, they are not all heavy adult content. It depends on the kid, what she reads, and what parents allow.
Exactly, I don't think 19 Minutes is too inappropriate, although if she's the sort of kid that gets freaked out about stuff, then it might be worth avoiding until she's out of high school (it's about a school shooting). My Sister's Keeper, however, is most definitely age appropriate. Handle With Care was another of my favorites.
Hunger Games is excellent, but I would think that she's probably read them by now or, if she hasn't, she doesn't want to. If she likes Hunger Games then I would recommend Uglies by Scott Westerfeld. It's a trilogy, with a related book tacked on. The Gone series by Michael Grant is pretty interesting too. They are both dystopian society type series, like Hunger Games.
At her age, I also loved The Curious Incident of the Dog in the Night-Time by Mark Haddon. It is written from the perspective of a boy with autism. Mao's Last Dancer is very good and there is a movie. It is about a boy who was a ballet dancer in communist China. The Kite Runner by Khaled Hosseini or A Thousand Splendid Suns by the same author are fantastic, but do have some heavy content - they are set in Afghanistan. The Power of One by Bryce Courtney is also good - it's considered a classic in Australia, but not so sure about the U.S. John Marsden is another great Australian author; his series Tomorrow When the War Began is another must-read for Aussie teenagers.
How about a classic? Pride and Prejudice, The Great Gatsby, Little Women, something she could love for a lifetime...............P
Agree with this. Let her read some of these wonderful books before school ruins them (unless she has an excellent teacher). I love Pride and Prejudice (and fortunately my year 11 literature teacher helped encourage that love), so I think that could be a good one to start with. Little Women is another of my favourites, although I did read it when I was a lot younger than your niece.
I know some bookstores in Australia offer (or used to offer) return cards with books, so you can just put the card inside the cover and they can exchange it if they already have it. It might be worth seeing if any bookstores in your area offer something like that.