Young hen having feathers on head pecked off!

[Wyorp Rock]

I think you all are right about it being mating. She is so submissive that he is always mating with her more than the others. The others are broody so they mostly chase him off or run away. But not my little girl...
Is there anything I can give her to make her feathers grow back quickly? How long does it usually take?
As for abby bullying her im going to start working on getting their run finished immediately and start giving them more to do in there.
I really really appreciate all the advice, it makes me more sure on what to do and if I am doing something right.

There's only a few things you can do since the damage is from mating. Separate out Mr. Rooster to give her a break and/or a saddle would be good too. The baldness on the head, that's not going to come back until molt, but if he's mating her a lot, then likely she will continue to be bald. Most feather loss on the back usually doesn't come back in until molt as well, ime. Feathers are broken/worn with an intact shaft.

 

[CreveChris]

Poor baby Raising more chicks now, but currently only have four hens to one roo and they all wear saddles. The feisty Marge has a bald spot on her back which prompted the saddles. Mine are handmade by sisters on Etsy: divafeathers

This is my Crèvecœur flock in frocks