Hi Samantha,
Welcome back to the Disney Parks Moms Panel!
First, every restaurant in Walt Disney World is "kid friendly". My son is 3 years old and he has dined with us everywhere, including at almost all of the Signature dining locations, as well as the 3 restaurants you're asking about. He can definitely be a picky eater and he has always had plenty to eat wherever we go.
Cinderella and her family aren't present at the Supercalifragialisticexpialidocious Breakfast at
1900 Park Fare. I find that to be one of the best character dining experiences on property, regardless of the meal, with a great variety of food from which you and your family will be able to choose. If you're looking for a Princess character meal, however, breakfast here isn't essential
As for
Cinderella's Royal Table at Magic Kingdom Park... The food is quite good, Cinderella herself is just lovely, but I'll admit it's not my favourite Walt Disney World Resort dining experience, character or otherwise. We don't often purchase the Disney Dining Plan, so I find it quite expensive. BUT, because I believe this is your little girl's first trip to Walt Disney World, I think she would love to dine there because what's not to love about dining in a Castle? I would keep this one too.
We ate at
Akershus Royal Banquet Hall on one of our more recent trips. My little guy had the meatball and some rice, as well as their delicious desserts and loved every bite. I also found the princesses to be wonderful with him. I would keep that reservation because it is quite different from Cinderella's Royal Table and your little girl will likely love it too.
Have a Magical Day,
Lynne