I am editing my post since the newest pic was added at the same time. Wow! I would cover it with neosporin (if you are using the kind with painkiller make sure it doesn't have any of the 'caine meds in it like lidocaine, as it is toxic to chickens...Neosporin (the brand) uses something else for pain, so theirs is fine to use). I would recommend keeping her isolated so that it doesn't get infected. I wonder what got her? The other hens pecked it worse, but I doubt they started it. I have heard of rats attacking hens at night from the rear, so maybe something bit her and the hens were attracted to it from the blood. Poor thing!
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