I have a chicken with a bare spot - meaning no feathers. i first thought she was just being "used" to much by the rooster, but now she has no feathers and she quit laying all together. she's buff orpington. someone once told me that was a sign of mites but i see nothing crawling on her. is there something i should know? any suggestions. She is fine otherwise -as are everyone else in the coop (and the other hens are laying - sparingly - but still laying).