Seems to have gotten worse. I noticed some feather loss midweek. She's a bit dirty here cuz I was feeding her and the others some yogurt but here is an image. Any help will is greatly appreciated. Stevie is my favorite hen. On my profile i have a pic in her normal state and it was taken 2 weeks ago. She is scratching at her head a little bit but eating well. She has been getting ACV in water but no other treatment for anything. Her coop mates are showing no signs of it and I do not have a rooster.