Hi Morgan,
It sounds like you want to meet lots of princesses on your trip!
Generally, I find that the best way to meet the most characters efficiently is with character dining. This way, you can meet a lot of characters without waiting in line. The two character dining options with the most princesses are
Cinderella's Royal Table at Magic Kingdom Park, or
Akershus Royal Banquet Hall at Epcot. You can meet many different princesses at each of these locations. Which princesses appear on any given day is subject to change. While some restaurants offer character experiences only at certain meals, you can always check their websites to see which meals are character meals.
While you might meet Ariel, Belle or Snow White at a character dining experience, you will not currently be able to meet Anna and Elsa from Frozen at a character meal. To meet them, you must visit them at their Royal Sommerhus at Epcot. My suggestion for you to meet the most princesses quickly is to make a reservation at Akershus Royal Banquet Hall and a Disney FastPass+ selection for meeting Anna and Elsa at their Royal Sommerhus right after that. These two locations are both in the Norway pavilion, so it is quick to get from one to the other!
In Magic Kingdom, you could do something similar by dining at Cinderella's Royal Table and then making Disney's FastPass+ selections for Princess Fairytale Hall. The princesses are in groups of two typically at Princess Fairytale Hall, so you might need to make more than one Disney FastPass+ selection to meet all that you want to. Currently, Belle does not appear at Be Our Guest Restaurant, which is set in Beast's Castle.
I hope that this information is helpful for you, Morgan. Please do let us know if you have any further questions!