Our Rhode Island Rooster has been treading her excessively. Because she's molting, he's even pulled out all the feathers on the back of her head.
I intend to isolate her in her own area as soon as I can, but don't have it set up yet.
I'm in Oklahoma. We noticed she started loosing her feathers when it started getting warmer. I don't currently have any pictures but I'll post some as soon as I can.
I would separate one of them, but I'm still setting up a spot for that as the only space we have closed off is full of chicks and much too small for either of the full grown chickens to be closed into
Looks like the feather loss on her back from what I can see is due to mating/treading and not molting. Loss on the back of the head is normal for mating as well.I've bought some vetrycin and some 'Pick No More'.
How old is this rooster?
Some hens are very docile and can be overmated. Moving the rooster, not the hen is a solution. You leave a hen with the hens unless they are picking at her too.
Comb damage from what I can see is fairly minimal, but it needs to be watch. The vetericyn will help.
Pick No More will not stop a rooster from mating, it does have antiseptic properties which can help promote healing of the comb though.
Separating a rooster is not punishing him, it's managing him. Having more space and ladies can often help. If the rooster is immature, he may calm down as he gets older.
Separating a rooster generally will not lower him in the pecking order. The hens have a pecking order and the rooster revolves around that pecking order, keeping peace within the flock (or a good rooster does that). He minimizes hen squabbles and keeps the girls in line. A hen would rarely have any dominance over a rooster unless she's mature and he's immature, then she may be able to avoid/deflect his advances until he matures.
A lot depends on your goals of having a rooster. Is he for fertile eggs, eye candy, you just like roosters, etc. A rooster that causes stress within a flock of hens needs to be managed. He can still be put with the ladies to fertilize eggs if you want fertile eggs, but he won't die if he's living alone for periods of time as long as he gets some attention and has some space.
I keep roosters by themselves or even with just one hen, but they are managed closely. I know what rooster I want to fertilize eggs and just put him with the hens for about an hour each morning. I may skip several mornings or if the hens go broody, then he doesn't get any visits for a while.
You can also separate him in a place were no one can see or hear him for a few days. That will lower him on the pecking order, and may help your girl get some dominance over him. Some roosters it helps, but with most its not a cure.