There's the line (was over an hour in early December afternoon last year) to meet a random rotation of 3 princesses.
There's an area with picnic tables with coloring pages, crayons, stickers, and crowns.
On the opposite side from the crafts area, there's the store with princess stuff, Prince Phillip swords and shields (made of foam), and some sort of face-painting and hair stuff.
And on the stage, down from everything, there's the Coronation Ceremony at scheduled times (singing and some sort of ceremony that involves princes and princesses, I believe), and there's also set storytelling times with a rotation of princesses (a surprise when the princess comes out). Those two things are done at separate times, of course.
And lastly there's a counter service place with goodies and bratwurst type things.
My son at 3 wanted to meet princesses, ANY princesses. He loooooves the attention he gets, and looooooves pretty 20-something women (he has the taste of a college boy, I swear, from the women he chooses to make little-boy eyes at), so he really wanted to meet them. He was fairly patient with the line. There was a bad start b/c he met Belle first and had NO idea who Belle was, and she was asking him to sit on her skirt which is weird for a rule-following kiddo. But that yielded some funny pictures (that I titled "sorry Belle, he's just not that into you") and he was more than happy with Pocahontas (probably b/c he thought she was Sacajawea from Night at the Museum though) and Princess Minnie.
But if your child is going to be upset that she can't meet one certain princess, I can't recommend waiting in that line. You don't get to find out before it's your turn, you can't wait to the side until the desired princess is there. You might see "your" princess LEAVING of all awful things to see. So if your girl is going to have a problem with that, I would NOT do the line to meet them.
Hope that helps!