Missing feathers. Help!

[abbikings]

One of my silky bantam hens, about a year and a half old, has been losing feathers on her mid back and wings. Of my six hens, she is the only one exhibiting any feather loss. I have not seen her being picked on, but I have seen her preening her feathers around that spot on her back once in a while. We don't have a rooster. I used DE around the coop, but like I said, none of the other birds have any issues. I don't necessarily think it is a pest. Is this nutritional? I provide meal worms as treats, and they have a complete layer feed. She is a bit runty, so perhaps she's not had as much access to meal worm treats. It looks terrible, and after a couple weeks does not seem to be getting better. Any advice would be appreciated! Thanks

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[CityKidChickens]

she could be molting but other than that I don't know

 

[two j farm]

I would say over mating but you said you don't have a rooster. So I'm not sure hope you find out.

 

[pinknblackchaos]

Just because you dont see picking doesnt mean its not happening. All except one of my hens has spots on their backs similar to this. I think the one with nice full feathers is picking at the rest. You just seem to have one chicken that is the victim.