I have a chicken (easter egger) that is just over 2 years old. For a while she's had no fuzzy feathers on her bottom. I'm assuming one of the other chickens is plucking them, as I had 1 other chicken that was being aggressive to the other birds, which I have isolated for the past several weeks. While other chickens had feathers on their back that have grown in, this one hasn't grown the fuzzy feathers back in on her bottom yet. I've also noticed that her eggs are a little thinner shelled (more fragile) than the others. Is this just a case of a chicken plucking her own bottom, one of the other girls doing it for her, or something to be worried about? I can get pictures if necessary.