I just noticed my white Leghorns feathers on her head are thinning and more of her red comb area is exposed. Is this normal? She is 1.5 years old. She is laying normally, active. We have a Golden Comet that we got at the same time as her and three EE'ers that are 7 months old. No one else has this thinning. She has always had a stellar comb and waddle, huge!