My 7 month-old silkie is being a brat. For the past month or so I've caught her pulling feathers out of her flockmates' behinds. She's been close to laying, so I chalked it up to stress, hormones, whatever. She started laying this week and the plucking behavior has gotten much worse-- she has pulled nearly all the tail feathers out of my RIR, and started pulling out the feathers on the back of one of my BO's neck. My flock has plenty of space, fresh water and plenty of food, and gets daily treats of scratch, cracked corn, greens, and mealworms. I've tried upping the protein in their diet by doubling their daily ration of meal worms and adding scrambled eggs, but the silkie is still tormenting certain members of the flock. I put her in a brooding pen (2'x3') with water, food, and pine shavings for bedding right next to the flock's run. How long should I leave her there? What should I do with her at night? Bring the brooder pen into the house for safety from predators, or allow her back in the coop to sleep? Any other tips on how to break a feather plucking brat?