Hello Fernanda!
Welcome to planDisney! If you are interested in meeting princesses then coming to Walt Disney World Resort any day will make all your dreams come true!
Now, there is no such thing as Bella's Castle but I think you are referring to
Cinderella's Royal Table in Magic Kingdom Park. Located inside the beautiful Cinderella Castle situated right in the center of Magic Kingdom Park is a regal restaurant filled with princesses. Breakfast, lunch, and dinner are all meals where you will get a chance to meet Cinderella and her princess friends. Last time I enjoyed a meal here, my family had a chance to meet Cinderella first and then Snow White, Jasmine, and Ariel while dining. The princesses vary so I can't guarantee that's who you will see that day but whichever princess is not needed in her kingdom will be present. Since it seems that your timing is flexible, grab any reservation you can get.
Advanced dining reservations at this location are difficult to get as this is a very popular dining experience. Don't forget your autograph book and appetite!
If you were looking for Belle from Beauty and the Beast then I suggest you visit
Enchanted Tales with Belle which has finally returned to the Parks! You will see her old home and then through magic visit her in the Beast's enchanted castle! If you want to dine inside this beautiful castle then you should try to secure a reservation at
Be Our Guest Restaurant which is another beautiful dining experience. There is a chance to meet the Beast as well as he roams through his castle.
I hope this helps and you have a magical time! Remember, Cinderella tells us that "if you keep on believing, the dream that you wish will come true."
Happy Planning!
-Nimmy