I have just heard of a new book that may interest your daughter: Lucy and the Liberty Quilt by Victoria London. It is the first in a series for gifted girls. Since she likes animals, have you looked at the Misty of Chincoteague horse series? Saddle Club books are also a popular series, but I am not fully familiar with the story line. The Babysitters Club: Little Sister Series has a young main character, Karen, who is gifted (I believe she may be grade-skipped) and solves a different problem in each book. The original American Girls series (Felicity, Samantha, Molly, etc.), are also a good read for young girls and gently combine fictional stories with history. Gifted children often love non-fiction, and there are many animal books and magazines for your daughter's interest. The Zoobooks Magazine series, or National Geographic World (the kids' magazine) are great and all kids like to get stuff in the mail! I hope you find this helpful. Good Luck!
Finding Books for an Advanced Reader
Gifted and Talented Expert Advice from Noreen H. Joslyn, LISW, ACSW