Might just be molt too, here is a link that shows what to look for, does she have swim water all the time? . How about a drake/ they can pull out feathers when mating.Quick question. One of my girls is losing a lot of feathers and down. She as a little bold spot on her side that is getting bigger. Could this be feather Mites causing this? If so how would I go about getting rid of them?
http://www.grit.com/animals/poultry...tion-treatment-in-your-backyard-chickens.aspx