Hey fellow chicken lovers! I have a black Australorp hen, 19 months old, hand raised by me & my husband, fully vaccinated as a 2 day old chick. She is one of 14 hens, most of which are molting right now. She looks the worst, with a lot of feather loss, including around her head. Her comb is pale. She does have new feather growth, but she is walking funny and lays down a lot. She is eating and drinking. No respiratory symptoms. She was wormed a couple months ago. I have not seen any mites or lice. Any ideas? Thanks so much in advance!