Yes I've checked her multiple times because she was looking ratty even before, but nothing. This is weirdly her first ever adult moult (she's about a year and 4 months old), so it was about time. I also did a major coop clean, sprayed with permethrin, and installed those little cups of oil by the roosting bars that hinder red mites from reaching the chickens at night, just in case. I did find a few red mites (I hate those guys!) so hopefully this improvement will help her recover

I know what its like to be anemic and it can definitely make you breathless.
She's looking really good otherwise, good colour, energy, appetite etc, so for now I'm also just keeping an eye on her.