Thank goodness you figured this out! I would try what someone else had suggested about removing the hen for a few days to bring her lower in the pecking order to see if that helps calm her down a bit.
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As I was reading along in the posts this was my thought - that you have one really mean hen (vampire). I had one vicious ol' girl, I finally got rid of her and the kingdom is peacable once again. She did not peck anybody bloody (yet), she just screamed and pecked toward everybody, also...
Just a different thought. Can anything else get in at them? Such as something small like a rat or something? Is there any chance they can get into anything like poison? You will need to remove the new pecked girl or they will pick at her as well. Gosh I am so sorry this is happening and it is so...