Hello. I have four silver laced wyandottes. One was broody for weeks and has stopped about two weeks ago. Last week she has started losing her feathers...A lot! She is completely bald underneath and there are feathers everywhere in the coup and garden. No other hens are showing signs of molting. Any suggestions what this could be? Or is it normal?! Iv had these hens for over 12 months with nothing like this happening before.