I just went out to check on my 8 10 month old pullets (3 Barred Rocks, 3 EEs, 2 Buff Orpingtons) to make sure they had all returned to the run after free ranging in the snow. One of my barred rocks looks bad. She is missing her tail feathers. I can't see skin but her long stand up feathers are just gone. On the back of her neck she has a number of broken feathers. Plus her usually bright red, full comb is dull pink and shrunken. A couple weeks ago one of my BOs had broken feathers on the back of her neck so I was keeping an eye on things and didn't notice anything amiss until today. Would a feather picker pull out another chicken's tail feathers? Could being feather picked cause her stress to the point where he comb looks dull and shrunken?