Please help. My 7 month old Orpington has had a pale comb for about a month, now seems to be missing feathers on face. Eats/drinks/acts fine other than occasionally stretches her neck and makes a loud half scream noise. Housed with 3 others that are perfectly fine. I've been adding eggs or oatmeal with Nutri-drench to her daily diet of layer feed. She's free range during the afternoons, and often is slower to come running than the others. I'm not certain that she's laying.