My kids are not PG, but it's hard for me to write off children's lit at age 7, even for PG. I don't doubt that she can read very hard books, but she doesn't HAVE to always reads that high, you know? There's so much good stuff in the 5th-7th grade levels. It's still very young.

There are a lot of older books out there, often British. Has she done all of Frances Hodgson Burnett? Tom's Midnight Garden? E.Nesbit? Green Knowe? Narnia? Noel Streitfield? The Borrowers? The Moomintroll series? Swallows and Amazons? The Bagthorpes? Joan Aiken?

For adult fiction, you could try Dickens.