I have a Cochin that hatched 3 chicks at the beginning of May. She booted 2 of them at an age appropriate time, but let the 3rd and littlest one stay with her. This 'little one' is now 20 weeks old and regular sized. The momma has been broody and has been sitting on an empty nest for a month. This chickie will not leave her side and she isn't doing anything to make it go. Should I do anything about it? It wouldn't be such a big deal if the chickie weren't pooping in the nest box all day while he/she sits with her momma.