DD is almost done with all the Ramona books. These are great for young advanced readers since the reading level is fairly high but the content is young.

For fairy lovers, the Fairy Realm series by Emily Rodda is more challenging and better quality than Rainbow Fairies.

Roald Dahl, Little House on the Prairie (you may want to discuss the attitudes towards Indians) and EB White have been much enjoyed here.

For dreck series, we have steamed through A to Z Mysteries, Puppy Place, Magic Puppy/Kitten. These are easier. She has also been reading Nancy Drew, which I am rather meh on.

She enjoyed the Indian in the Cupboard and The Fairy Rebel (same author).

FWIW, Anne of Green Gables would be too hard for her, although she easily reads at a 5th/6th grade level. It's got a lot of high-level vocabulary and moves fairly slowly.