Limpy

I have a handicapped chicken.  I've no idea what's wrong with her, but her right leg doesn't support her weight.  She hops and tries to step on her right leg but it collapses under her.  I've grabbed her for inspection, and she happily hangs out in the football hold while I inspect her leg.  I've gone all over her foot for slivers, and massaged all up her leg, but she doesn't ever flinch, just sternly watches me palpating her stuck-out leg.The first couple days she stayed in or right next to the coop, and then she roamed a little farther, but not all the way to our house like the flock goes every day.  She seems to not want to get too far from the coop. I've had to put bowls of water in the woods in her range.  It's tricky to leave food out where she will find it before all the other chickens do.She doesn't seem to be in any pain, but she's obviously limited and subdued.  She's got that injured animal wariness, hiding herself in the brush.  It's a mystery what is going on for her if there's nothing she winces at, but she can't walk on it.----I had another chicken die.  No known cause, but she was an old chicken, one of the original set.  I was getting eggs out of the coop and she was in there, and she didn't skedaddle indignantly like they usually do.  I moved her aside, and she settled down like she was going to rest a bit more.I checked on her a little later and she was still there.  I stroked her head and back (a dead giveaway that she wasn't feeling well).  Her upside down lids closed and she fell asleep while I pet her.I checked on her in an hour and she had tucked her head under her wing and died:(