She sounds like my DD was! My DD loved dressing up and books were, and still are, her favorite thing. That age was so much fun. We had tea parties and played dress up. Since I couldn't fit into her dress up clothes all I ever got to wear was a hat.

My SIL got my daughter a chest (cardboard) of dress up clothes that came with plastic shoes which were a part of the Disney princess stuff. There are also just shoes sold separately. How about a pair of wings, a wand, costume jewelry, anything that she can use for dress up. Another idea for books is a gift card to a book store, even for just one book, so she can have the fun of picking out a book.