I second Sanderson, Snicket, Huff, Pierce, Butcher, Aspirin, and Mccaffery, particularly Mccaffery's Brainship books in her case.
To add to the pile, I'd recommend Patrick Rothfuss' Name of the Wind, which is a substantial chunk of book but never once lost me. Rothfuss has an amazing command of language - I dare you to read the prologue to the Name of the Wind and say it is poorly executed. (I can almost recite it from memory, and I have not put effort into learning it!)
Rothfuss has also written the book that I feel has had the greatest personal impact on me. (The Slow Regard of Silent Things.) I'd recommend it as well, but though it's much shorter, it's a side story to the Name of the Wind: I feel it needs he background of the first book, at least.
(That said... The Slow Regard of Silent Things is a book that you feel ashamed to have bought at a bookstore. It feels like you should have discovered it in a locked trunk at the back of someone's attic, or given to you on your eighteenth birthday as an inheritance. Something about it seems timeless. After I read it, I ended up walking down a gravel path in the city at ten in the evening with my shoes off, filled by a fae mood that made everything beautiful and important. I'm not certain it's for everyone, but... To me, it was a book that showed it was possible to demonstrate the unexplainable.)