Yesterday while I was cleaning out the old coop, I noticed that my partridge rock didn't seem to be quite herself. She seemed a little fluffed up, and wasn't moving as fast as the other chickens. She still was happy to leave the run and go free ranging with everyone else (for the first time ever- this batch hasn't gotten much of a chance to leave their run). Her comb seemed a bit pale as well.
Today, she was markedly worse in the morning. By dinnertime, she was laying on her side.
I've put her in solitary confinement (I'm so glad I have that tiny time-out coop!!), but I'm not at all hopeful for her recovery. If/when she dies, I think I'll have a necropsy done.