Fernanda there are several opportunities to dine with the Princesses at Disney, the most popular is Cinderella's Royal Table. This is located inside the Castle at the Magic Kingdom and offers breakfast, lunch and dinner. The Princesses often present are Cinderella, Belle, Snow White and Aurora, details and menus can be found
HERE. This restaurant requires 2 dining plan credits.
Another option is in Epcot, over in the Norwegian Pavilion you'll find Akershus Royal Banquet Hall. Again this restaurant offers 3 meals and has very similar Princesses to the Castle. This is a cheaper option and only requires 1 dining plan credit, details can be found
HERE.
Another Princess restaurant can be found at the Grand Floridian Resort, this is a fun buffet dinner held at 1900 Park Fare and is hosted by Cinderella and Prince Charming. Normally also in attendance are Lady Tremaine (Cinderella's Step-Mother) and Anastasia and Drizella (Step-Sisters) Details can be found
HERE.
I've dined at all three and I found the best character interaction to be at 1900 Park Fare, the Step-Sisters were just hilarious but for the age of your daughter I would recommend one of the other two. The Princesses are almost identical at both restaurants and both have photo packages included. At CRT the photo is normally with Cinderella and at Akershus it's generally Belle so that may sway your decision. If cost is a factor then breakfast at Akershus is the cheapest option, also have a look at the menus as again this could help you with your choice. I'm sure whichever you choose your daughter will have a great time just be sure to call 407-939-3463 up to 90 days in advance to book reservations.