Do you need to clean it off? Or will she take care of it herself by preening over the next few days?What is the best way to clean all the blood off of her? She's coatedWasn't sure if a bath would be a good idea because she's already pretty stressed.
If the blood is likely to cause a problem for the chicken, then it can make sense to clean it off. But if it just makes her look ugly to human eyes, I would be inclined to leave it for now. Chickens seem to be quite good at cleaning themselves up from many kinds of messes if you just give them a few days to do it. (If she was covered in something toxic my advice would be different. But blood is not toxic.)