Boy, I tried separating her in a crate in the coop. That lasted one night, as she was absolutely miserable, which made everyone miserable! No easy solution here, but I appreciate the replies and support.
Can anyone tell me the danger of eating eggs from a hen who is on SMZ TMP? I have 27 chickens and it's impossible to moniter her all day until, if, she eventually lays an egg so I can discard it. Vet says not to eat her egg for two weeks. Difficult task.