When a female is the protagonist in Children's Theater and has famous name recognition --- Cinderella, Sleeping Beauty, The Little Mermaid, Rapunzel -- as a director, you have a hard time getting boys to join the cast. Young boys usually stay far away from any play that even hints of a love story.
(These are good for the casts that have many more girls than boys, which seems to be the norm in Children's Theater.)
I actually wrote this show for a group of kids I knew pretty well at a local elementary school. Of the 45 kids in the cast, we had about equal numbers of boys and girls --- VERY UNUSUAL FOR CHILDREN'S THEATER!