What is causing this?

[Burnlem]

View attachment 1402713 Today while taking care of some bumblefoot problems, I noticed the abdomen area of one of my chickens. This is the hen that was broody a little bit ago, would that be the cause of her loosing feathers?

I just noticed this from one of my Austrolorpes - she's only 8 months old (already brooding?) she does stay on the nest a lot, and she is sleeping on the floor of the coop, not on the roost with the others - any thoughts?? thx