Our Blue Andalusian (tango or cash I can't keep them straight) has a big bare spot on her chest. My wife has caught the other chickens plucking her feathers out but not attacking her. No broken skin. No mites. The just started laying this month. It looks distended. She is otherwise acting normal. Is this a molting thing? Not sure why the others are eating her feathers. They have plenty of oyster shell and grit in the run & food. Meal worms and Oats Anything to worry about???