I think I've solved your problem:
http://en.wikipedia.org/wiki/List_of_Oz_books
the 15 or so I've read are perfect for a princessy 5 year old, IMHO. Some are a bit weak on plot, but I think that might be a benifit for the 5ish crowd.
Wonderful characters and lots of action and description.

Also try -
E.B. White
Rold Dahl
Bruce Coville
Little House on the Praire series

http://www.hoagiesgifted.org/girls_women.htm
is a wonderful resource.

cultivating librarian friends has been a great help to us.
Also amazon.com's 'Other people who bought this book also bought' feature.

Best Wishes,
Grinity


Coaching available, at SchoolSuccessSolutions.com