Yes I do mean scratches or wounds, and yes they usually stay bare backed until the molt because the feathers are usually broke off. If they are pulled out they may grow back. If you don't have a rooster she will be fine. A spray of bluekote can disguise the skin color if you want, refresh as necessary.
Roosters favor hens that are in peak production, as well as those that aren't as high in the pecking order. With her comb color and size she is in peak egg laying condition, and looks overall healthy in the photo, though quarantine is always recommended.