Personally I'd put the roo in "freezer camp"(I like that term
). You could try keeping the hen away from the others til she if fully recovered (afore mentioned 2nd hand dog crate) and when you reintroduce her, do it after they are on roost. At which point I'd take the new lead hen and crate her for a few days to a week. Re intorducing her may drop her down the pecking order.
