At first we thought Alex was molting but the other girls in her flock are fully feathered at this point. We have a rooster, too, and we thought that he was favouring her a bit too much, but she is simply not re-growing any feathers. We also think she is the one laying thin-shelled eggs, that break in the coop. Having hard time finding a chicken vet and thought I'd first ask if this is serious in here.