I have a hen who has started to pull her feathers out... I have 4 chickens, 3 hens, 1 young rooster. My oldest hen (2 yrs) has started pulling her feathers out.. She was broody for a while and was sitting on eggs but now she is more socialble with the other chickens but has started pulling her feathers out. There diet has not changed and they are getting fresh water everyday. With the snow, I snow blowed out a large area for them to come out of the pen but they don't like the snow on there feet so they have been staying in the pen with the door open during the day... How do I get my hen to stop pulling out her feathers????