She is a three month old black Sex Link. I have noticed her pulling out her hatchmates' feathers before. But today, I noticed she is bare under her wings on her body. I checked for mites and lice and saw nothing. I separated her from the rest of the flock to try to encourage her to eat more protein. She doesn't seem very interested in animal protein. Since I have a mixed flock of ages varying between 3-9 months, I feed a combination of layer crumble, grower crumble, BOSS, a tiny bit of scratch, and daily kitchen scraps including meat. They free range and forage every day as well. They are not overcrowded in their coop either as it is enormous. Any suggestions? She does seem large for her age and skittish. Is she just stressed?