What can I do to help her?

[Ldemos]

Not sure what is going on with one of my hens? Is she molting? All my other chickens have already molted.

 

[MarlaMac]

Is she being picked on by the others? Looks like her feathers are missing with red blotches underneath. Molting can cause red blotchy skin, but it is usually from the pin feathers growing in. It is hard to tell in your pictures if that is the case.

Have you checked her over for mites/lice?

What is their diet, including all treats? Asking b/c if she is having her feathers pick out by the others it could be a protein deficiency in their diet.