One of my chickens got pecked so much she bled.
Not to bad, on her chest. she is missing the top layer of her chest feathers too. What can I do to help her recover? How long do you think it'll take?

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I didn't think it was possible either, but I see the others doing it! She isn't broody. (she's a gold star) All of her chest is being pecked, but the spot where it is bleeding is more up by her neck.Mostly, separate her so the others won't keep pecking her, as they will peck a bloody area.
Any basic wound care is fine, except don't use a topical med with a "caine" drug such as cetacaine, benzocaine, etc. A little soap and water for cleaning and then some Neosporin or similar is fine. Many people keep BluKote or another gentian violet med on hand. It's an antiseptic, plus the color masks the color of blood, so often the bird can be returned to the flock sooner. (If you're not familiar with it, it stains everything.)
The chest is an odd area to be pecked. Sometimes an injury in this area is from having injured themself on something in their environment. If they're going broody, they will pull their chest feathers out in preparation for setting on eggs. I haven't actually seen or heard of one bringing blood doing this, but anything is possible.