At CRT, Cinderella meets in the lobby for photos and autographs at all meals. She does not come to your table.
Then you go upstairs to the restaurant. At breakfast and lunch, it is an assortment of princesses and friends - four of them rotate through the room coming to your table for autographs and photos. At dinner, to my understanding, it is just the Fairy Godmother and Suzy and Perla (the mice).
So, if you want a "princess" experience, book breakfast or lunch.
At our first breakfast, we saw Belle, Snow White, Jasmine and Fairy Godmother.
At our second breakfast, we saw Belle, Snow White, Jasmine and Aurora.