I have two girls in a quarantine area and today I noticed one lying down in the main part rather than in the "boudoir" area. When I reached in to clean, she got up but gimped off to the boudoir. She really doesn't want to put weight on that foot. When she stood up, she had her foot curled off the ground so I checked for a wound but didn't see one. How do I tell what's wrong and how do I fix it?