Hello, my Australorp has very recently started losing all her feathers on her neck and has had loss of feathers around her head. I thought it was lice but have checked and can't find any signs. I have dusted all 4 of my hens and their coop but doesn't seem to be fixing anything? Is this something bad or normal, or am I doing something wrong? No signs of feather loss on any of my other hens and they all seem to have no issues. Help, please!