Hello, Mae,
May I be the first to wish your granddaughter an early Happy Birthday! I would imagine getting to spend her special day at Walt Disney World and having breakfast with princesses sounds like a perfect celebration.
While I don't think cake with breakfast is a typical experience for most people, having it once a year to celebrate a birthday is something that I think would bring joy to many people. To help you know if it would be worthwhile for your family, I'd first take a look at the
breakfast menu at Akershus Royal Banquet Hall. If it looks like your family will have some room leftover after breakfast, a birthday cake could be a nice way to start your granddaughter's birthday. To order a specialized cake, you can call (407) 827-2253. It may also be helpful for you to talk with a cake specialist about different options and costs to make a more educated decision.
If you prefer not to order one, but change your mind once you arrive at the restaurant, there are generic ones available without previous notice. Just let your server know you'd like to have one for your granddaughter's birthday. Also, throughout the parks, there are lots of other treats and cupcakes that you could use to celebrate her birthday later in the day, too.
Have a wonderful birthday day at Walt Disney World with your granddaughter! Please let us know if we can help again. And, make sure to pick up a complimentary Happy Birthday button pin for her at Guest Relations so others can join in with wishing her a happy birthday. -Kara