My Bantam Cochin is not moving around, and I'm worried about her. We came back from vacation, and thought she was broody, but she is not moving, or joining the flock. While she is eating a bit when I place food next to her, she remains in one place. She moved from the ledge where I placed her outside over to a flat surface, and did not appear to be limping, but simply placed herself down. Any suggestions? How do I know if it is Marek's?