That is exactly what I do. Her own space, but with the others around. I also give them boiled eggs and livestock electrolytes (stress-aid) in their water. I've never looked up what it is, maybe a vitamin deficiency? I just know that one day they can't use their legs, and after some care, they come back. They always have a good appetite (so not "illness"), just, no legs. Happened to three of my hens, I think. Save Betsy!