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I don't know the answer, but it is not a stupid question.
If your hen has any blood, the others will definately peck at her. You will have to separate her, clean her up, and check to see where the blood is coming from.
The following is from "The Chicken Health Handbook" by Gail Damerow
"Prolapsed Oviduct, also called "blowout" or "pickout" is a condition in which the lower part of the hen's oviduct turns inside out and protrudes through the vent. Prolapse occurs most often when a hen starts laying at too young an age, is too fat, or lays unusually large eggs. Caught in time, the prolapse can sometimes be reversed by applying a hemorrhoidal cream (such as Preparation H) and isolating the hen until she approves. Otherwise, the other chickens will pick at her vent, eventually pulling out her oviduct and intestines and causing the hen to die from hemorrhage and shock. Not all vent picking is due to prolapse, but instead may result from faulty management - feeders, waterers and roosts may be positioned in such a way that birds below can pick on the vents of birds above.