Before you decide, find out if there are certain characters that she absolutely loves.
If she is Pooh fan, then I would suggest Crystal Palace for breakfast.
If she is a Princess Fan, there is nothing like eating in Cinderella's castle... however those PS are very had to get, but the Storybook Princess Breakfast is a great alternative. Or she could have dinner with Cinderella and her friends at 1900 Park Faire.
If she likes Donald, then Donald's Breakfastosaurus at AK.
If she likes Minnie, Goofy and the Gang, then go to lunch at Hollywood and Vine. This is a huge favorite of ours!
And if Mickey's her man (err Mouse) then Chef Mickey's.
However, if you want the best breakfast, a combination of characters that you don't ordinarily see and great service, go to our favorite... 1900 Park Faire for breakfast! The characters there can include Mary Poppins, Bert, Alice in Wonderland, the Mad Hatter, Pooh, Eeyore or Tigger. There are usually 5 of the characters there, 1 or 2 greeting in the lobby and the rest circulating throughout the restaurant.
Whatever you decide, hope you have a great time!