I would just keep it clean and apply ointment.
Leave it unbandaged. Trim some of the feathers away from the wound so they don't get stuck in the ointment or dry onto the wound.
Keep her where flies cannot get on the wound.
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Move her somewhere quiet so you can tend to her wounds.
General care is to clean/flush wounds with saline or chlorhexidine, then apply triple antibiotic ointment.
Even when badly injured, a chicken can often try to act normal, but...