1 year old hen with bare back

[tgfmt]

I have 5 hens no roosters. They are well fed, free range for several
hours a day plus have a decent size run rest of the time. In last 8-12 weeks all the hens seem to be molting all but one is back to being fully feathered. I have one hen whose back remains bare. Just curious what could be causing this?? I have not witnessed any of the others plucking at her she’s definately not the most submissive. No signs of infestations that I can find. Anything I can do to help her out? Afraid her poor little back is going to burn. Attaching some photos…

 

[nuthatched]

What's their diet?

 

[tgfmt]

What's their diet?

Nature wise layer feed. Plus mixed chicken scraps from our kitchen most days but not excessive- fruits, veggies some meats, eggs mostly leftovers from my kids.

 

[tgfmt]

Have 5 hens and they are laying 4-5 eggs a day.

 

[nuthatched]

Nature wise layer feed. Plus mixed chicken scraps from our kitchen most days but not excessive- fruits, veggies some meats, eggs mostly leftovers from my kids.

Wha'ts the protein on the feed? I'd cut out all the scraps

 

[tgfmt]

18% I think. I’ll try that thx!