Al,
my hen is very happy and she can eat,drink,walk,hop up on her roost,dust bath,talk chicken with the flocks around her,she lays eggs and is a good momma she is just blind thats all.
It's no different than having any chicken in a cage, just she is in there by herself or with babies.
This is nothing like life support, i would have no problem culling her if i though she was suffering.