Hi Jennifer,
I think 1900 Park Fare and Akershus are both great character dining options! I don't think you'll be missing anything by not going to Cinderella's Royal Table. You'll see Cinderella at 1900 Park Fare and a whole bunch of other princesses at Akershus.
I love character dining, and each restaurant offers something different. If your little girl is a Disney Junior fan, then you'll definitely want to try
Hollywood & Vine. She'll get to eat with characters from Little Einsteins, Special Agent Oso, Handy Many, and Jake & the Neverland Pirates.
Crystal Palace with Winnie the Pooh and friends is another of my favorite dining experience. I tend to like the options served at breakfast, but lunch and dinner are both good too.
Some other dining options that you might want to consider: Whispering Canyon Cafe, 'Ohana, 50s Prime Time Cafe, T-Rex, and Boma.
Hope this helps. Have a magical vacation!