Thanks! I will check for mites, but no one else has any signs at all. She just started coming up more and more bald starting about 4 days ago and each morning more feathers are. I separated her two nights ago, the coop looks like a war zone. But her little isolation spot is full of feathers as well!
Feed wise they are free range all day. They have access to pond, woods, field and frequently clean under the bird feeder. They also have free choice feed, a mix of 75% Kalmbach layer crumbles and 25% Featherfixer. They get a handful of corn/sunflower seeds as a treat between the lot of them.
I am not 100% sure on the egg question, I think she may have stopped. She always layed dark eggs, and I do not think she is now but I do have a pullet who just started to lay who lays similar colored eggs so now I'm not sure whos egg is whos.
The difference between these two pictures took her about a week, its quite crazy!
She was a year old in July I believe...