For me, it all depends on the quality of catchers. I work with mine to develop them so they all have the skills to play. More often than not, I rotate them like I do the pitchers. That way no one is tired, or complaining about sore knees, or unable to go.
The differentiator for me will be the bat. If one catcher is hitting and another with comparable skills is not, I'll go with who is hitting. But even then not to the point of child abuse. Coaches should keep in mind that these kids are still growing, and the catcher's position can put an awful lot of strain on them over a weekend. I'd hate to think I did anything to hurt a young girl just to win a trophy.
None of this stuff is rocket science. Catchers can be taught just like anyone else, if they're willing.
She needs to get off the bench, though. If it isn't with this team, find one who can use her. A good catcher is always good to find.