The hen in question is roughly three years old. She has been acting lethargic as of late and is not walking or moving at all, except her head to drink. If you pick her up and move her she does not protest, and simply sinks back down upon being set down. It appears that she may not be able to stand, though her legs do not appear to be injured, and there are no visible wounds anywhere. A while back she suffered a raccoon attack (several months ago) but had since recovered. Any ideas as to what may be wrong would be appreciated. Thanks.