Thanks for the ideas and support. Unfortunately, when I went out to check on her, the hen had died. I do appreciate the time people took to address my problem.
I was closing the coops last night and surprised a raccoon on top of one of the hens inside the coop. The coon ran off and I moved the body of the hen to one side, to deal with in the morning. Come morning, she had moved a couple of feet-- she's alive! Her neck is very floppy, she can't hold...