There are so many great books at the 4th-6th grade level. I wouldn't skip them just because she can process harder stuff. My DD can read pretty hard books, but it's really important to me that she experience the "canon" of great children's literature...
I don't know what's available on tape, but I would recommend Zilpha Keatley Snyder and Susan Cooper. I second Golden Compass and Arthur Ransome. Tolkien, definitely. Lloyd Alexander. And of course, the many classics already listed, although I get the concern with things like racism.
Lord of the Flies is way too much for a 2nd-grader, though, IMO.
Last edited by ultramarina; 01/11/13 11:01 AM.