Hello (again) chicken friends! I have a chicken who I've had for over a year, she has always been subdued and a little shy compared to the rest, but doesn't get picked on and is part of the team (I have five chickens all together). I think she's third in the pecking order. She's never been a huge egg layer. She's an Isa Brown, and I've posted about her before - because I've always been worried about how shy and quiet she is compared to the rest. Recently I noticed almost all her tail feathers had fallen out and she was scratching herself quite a bit. Now all her neck feathers are stumpy or missing, and she has a white-ish powdery face and comb. Her comb has gotten duller and smaller and floppier.... any thoughts on what it could be? The rest of my flock are looking healthy and amazing, with bright red big combs and shiny feathers, clear eyes etc. Still has an appetite and seems happy! See pictures.... Thank you in advance chicken community!