One of my hens is missing the vanes on her wing feathers. The other hens do peck her but its not as bad as that. Her tail and wings have shafts but not vanes (the feathery part). What should I do? And how do i deter the others from pecking her? she also has bald pink patches on her wings. i thought it could be the moult but does the moult last for over six months??