The Maiden dress that you saw runs from a Youth S (6) through Youth XL (14-16) but it does run really small, and the skirt is pretty short so many like to wear leggings with in.
There is also a Buccaneer option for girls (it's ironically common for boys too). It is a burgundy outfit with pants. This one runs in the same sizes, but I believe it also has an XS (4-5).
The other options is a pirate garb shirt (no pants) - which you may see on Adults, but it also runs in youth sizes.
Yes and no. There is not a photographer in the room while the makeover is occurring, but guests are welcome to take as many images they want. Near the end of the experience there is a photo taken and it is printed as apart of the package cost.
1 pose, 1 portrait (first mate, empress)
2 poses, 3 portraits (captain, empress with costume)