I have a leghorn/ameraucana pullet that has a bald spot on her chest. It looks like molting, but she is only 10 months old. (I heard hens usually have their first molt around 18 months.) We dusted her for mites as a precaution. However, I did not see any on her. I have not noticed her in the nesting boxes acting broody. I don't think she has laid an egg in a while. We feed our chickens Scratch and Peck layer feed, clean water, healthy scraps, and oyster shells are available. What could be the cause of her feather loss?