We found this gorgeous three-tiered chiffon dress, and decided it was the one. It was sold through Amazon from a place called Webb Direct 2U, which is a children's specialty shop located in New Mexico.
We had her try it on to make sure it fit, and she looks like a princess! It is also available in black, a turquoise, and a light pink. I inspected it after taking it out of the package, and I did find a small hole located in the back of the dress.

We don't want to risk the possibility of an exchange not making it here in time, so I'm just going to use my Super Mom skills and sew it up real quick. It's not all that noticeable with the chiffon hanging over it unless you're looking hard at the area.
My only other complaint is that the shipping was $8.95, and it was sent through USPS. The package was small and lightweight. I don't understand how it can cost that much having shipped many small packages myself.
On that note, I do really love this dress. It is the perfect size, and it's going to look great with her silver sparkly shoes (another blog later to come as I ordered a size too small). She will definitely look like a princess that night, which she should because next year she's off to Kindergarten!