My 22-week old red cochin has been laying nearly daily for about 3 weeks. Now she sits on her egg almost all day and today, even after I took the egg from her, she kept returning to the coop to sit in her empty nest. She barely ate at all. She's also making screeching noises at me when I open the coop door to check on her. She looks perfectly healthy- just acting oddly. Is this broody behavior?