Aww, poor thing. Mine would be in better health had her former owner fed her right. Instead, she was horridly overweight with wrecked feet when I got her. I think I got her weight back down a bit, but the damage is done. She's gotten worse in winter for the past 2 years, but she's always bounced...
:hugs
I'm in the same position here. My 8 1/2 year old hen is failing and I can't see her possibly surviving the winter. But yet, I can't kill her while there's the slightest chance...