I don't have any advice, but I have a sort of peg-legged hen. She didn't lose her foot, but she can't use it. She hops on it, and gets around just fine. Slowly, but she gets there. She eats and drinks as normal, and no one bothers her. If she gets off balance at all, she gives herself a quick...
I'm keeping her cleaned up today. I splinted her foot this morning. She's eating and drinking a little, and laid an egg earlier. Fingers crossed that's a good sign!