Re: In need of good books for 8 year old girl
If you think she'd like the fantasy elements of Harry Potter but might be too young for the death and darker elements in the later books, what about Diane Duane's So You Want to Be a Wizard series? Strong female lead, and lots of the same fantasy/magic elements, but much less dark. (It predates Harry Potter.)
The Septimus Heap books and the Land of Elyon series might also appeal to her.