Hi Trisha!
You're going to have such an amazing time with your Little Princess!
Cinderella's Royal Table is a very regal experience to enjoy for sure.
I'd love to share with you a few of my favourite character dining experiences I'd most highly recommend for a young Princess to enjoy.
Cinderella's Happily Ever After Dinner at 1900 Park Fare is near the top of my list. Interactions with Cinderella, Prince Charming and members of Cinderella's family (often including her wacky stepmother and stepsisters) take place at your table while you enjoy the buffet selections representing "kingdoms" from around the globe. This venue is located in the Grand Floridan, easily accessible by boat or monorail from Magic Kingdom.
At the same location at breakfast time, you can enjoy Supercalifragalistic Breakfast with Alice in Wonderland & the Mad Hatter.
My top Princess recommendation is Akershus Royal Banquet Hall over at Epcot for
Princess Storybook Dining. Enjoy visiting with MANY princesses at this location where you also receive a complimentary souvenir photo package per group of four guests. As far as cuisine goes, I recommend breakfast at this location to please everyone in your group.
Other fun, character dining experiences that appeal to the younger set include Disney Junior Play 'n Dine for breakfast at Hollywood & Vine over at Disney's Hollywood Studios, The Crystal Palace for any meal time of the day with Winnie the Pooh and Friends in Magic Kingdom Park or good ol' Chef Mickey's for a fun time with your favourite classic Disney characters.
Wishing you a Magical time on your Walt Disney World vacation Trisha!
Kirsten