We have a 8 week old barred rock hen. She's outside in a coop by herself her brooder mates turned out to be roosters (we can't have them). Today during my daily time with her(free ranging in the garden) I noticed she kept pulling at her feathers. At first I thought she was grooming herself. But, noticed she was pulling some of the smaller feathers out of her wings. Is this something I should be concerned about?