There is CInderella's Royal Table, which is in "the castle" in Magic Kingodm. It is the hardest PS to get. Cinderalla and a few other princesses or characters are there. Generally there are at least four characters - Cinderella, Snow White, Belle, Sleeping Beauty, Mary Poppins, Prince Charming....some have seen Peter Pan or Aladin I believe...Somtimes the Fairy Godmother or another character is waiting in the lobby, too.
There is also the Storybook breakfast which is in a restaraunt in Norway in Epcot. It is a medieval castle, but it is not "the castle." It has a similar mix of characters, except Cinderella. We saw Jasmine, Pocohontas, Sleeping Beauty and Snow White (and maybe Belle). It is easier to get than CIdnerellas Royal Table, but not easy!
Both are great for a child who wants to see the princesses.
Good luck. I hope you get one or the other (or both!).
Enjoy!!