About 2 1/2 weeks ago one of my Nankin hens started sitting in her nesting box all day and night. Although nankins are VERY broody birds I am almost 100% sure it's not because she is not protective, she does not have any eggs and I noticed when one of my Mille Fleur hens was broody she left big amounts of poop in one spot (If that makes sense.) and she isn't. She was born on May 3 this year so she not even a year old yet. I have noticed a bit of weight loss compared to her sister. I have recently moved her into the downstairs of her coop with her sister which gives her more light and room. If you have any suggestions on what it could possibly be please feel free to reply.