I didn't mean the rooster was being mean to her. The feathers look worn from mating is all. That happens, even if a rooster is gentle, over time, the feathers can get broken and worn. The ones that look stripped though are a little different. I would follow up with the dusting.
Underneath her, I do see her keel bone, she is probably a bit underweight. The scabbing can be from roosting, getting into/out of nesting boxes, etc.
You mention they get scraps from a local food market, does that include a source of protein or do you provide a poultry feed to supplement?