the chicken who sits

I have a chicken who forgot how to walk.  She waddles around, and sets her tail on the ground.  It's very strange looking, and came on quite suddenly.This chicken took sick a couple weeks ago.  Comb went blue and floppy, she stopped eating and hunkered down into the pre-death chicken trance. I was sure she was done for.But she came out of it, as quickly as she went in.  Comb red again, although still floppy. Appetite back, hanging out with the other hens, even dust bathing.    Just one side effect.  She walks really funny, like it's raining all the time.I've looked it up.  She's an old hen, past laying, so she's not an internal layer or egg-bound.  It's been over a week, and although it looks so wrong, she seems otherwise fine, not struggling or suffering.   Just sitting around.