Recently purchased 4 Buff Orpingtons (possibly mixed) at a poultry swap. Three of the pullets are large and fluffy and nice looking, but the 4th one I went back to get (probably shouldn't have) is way smaller than the other 3 and has dirty feathers around her legs and butt and she seems to be missing feathers in her butt area. Her tail feathers also seem to be bent. She eats and drinks ok, is active....but just doesn't look "clean". Thoughts?