That does not look like a normal part of molting to me. It looks like a pecking wound. Somebody in the flock saw a bare spot, maybe due to the molting, and started pecking. Could also be rooster damage, if there was a rooster in their former home.
This girl should be seperated for her own safety, if at all possible. Chickens will go all cannibalistic on each other at the first sight of blood. If it's not possible to segregate her, then I would camoflauge the wound asap. Many people recommend blu-kote and/or peck lotions, which I have found to be useless. I use pine tar; a product marketed to treat horses hooves. It's messy and stinky, but very effective. It basically tastes so bad the other birds don't try to peck at it more than once. You can find it in the equine section of most feedstores, usually in little cans that resemble paint cans. I've tried several different things to apply it with, but gave up and started using my fingers. You want to use just enough to completely cover the wound.
Pine tar will make her feathers messy for awhile, but it eventually wears off. It also has anti-microbial properties to speed healing.
P.S. It may say something on the can of pine tar about "not for internal consumption". Don't let that worry you. They don't ingest enough to hurt them.