Re: In need of good books for 8 year old girl
Shel Silverstein could be a good choice, too, though it is poetry.
ODD enjoyed books by Jean Craighead George.
Dear America books are okay. There is another historic fiction series about various princesses. I don't recall the name of the series, but if you ask at the library, they should know. There's a book about Cleopatra, and Anastasia, and Eleanor of Aquitaine and others.
We found some of the Cornela Funke books to be a bit dark, though Igraine the Brave was greatly enjoyed.
Peter and the Starcatchers might be a good option. I don't recall how many books are in that series -- 3 or 4, I think.
PPs mentioned quite a few books I had forgotten. Definitely a good list among the posts.
Oh, and yes, Redwall is a bit dense. The audiobook of it is 10 hours or so, so it's definitely lengthy. My oldest, though, fell in love with the series at 8 and owns just about all the books.