Chicken has no feathers on belly!!! Help!!!

[Egg Yolk]

so I noticed my chicken, Itchy was missing a few feathers on her face so I picked her up and went to examine her. I then noticed there were no feathers on her belly.
Does anyone know what it is and how I can treat it? Also she doesn't seem sick at all she's normal except for the major feather loss.

 

[Eggcessive]

That can be normal. How old is she? Just look her bottom over well for mites (dark specs) or lice eggs (little yellow things near the base of feathers.)

 

[Imp]

Or, looks like a broody hen. They will pluck their bellies/keel.

Imp

 

[Egg Yolk]

I think she is 1 or 2 years old, not sure... But I checked for eggs and mites and there is nothing there. And if there were mites my other 11 chickens would probably have them too because they are all in a lare coop together and the others all have fluffy bellies.

 

[Egg Yolk]

Or, looks like a broody hen. They will pluck their bellies/keel. Imp

She isn't broody Im almost sure of it because my other hen is broody and also she hasn't laid an egg in a week because its so hot.