One of my fifteen "ISA Brown" hens is plucking out her feathers... I have not seen her do it however where her feathers are plucked tells me she is most likely doing it herself. Under her neck is bald, her wing pits are bald and a slight area above her breast is bald. My hens are almost two years old and this has been going on for about 2 months now. I know this can lead to terrible things and I would like to stop it before she is completely bald and bloody. Please help us, we love our ladies.