Ok I have a similar problem with my broody.
I now have 2 really sick silkies locked up in a big dog crate just outside the coop, I have two silkies that were showing signs in the broody hutch (I had no where else to put them) and my BO was weezing and coughing/sneezing terribly this morning so I put her in a small dog crate she isnt weezing as bad so hopefully the antibiotics is working with her.
Anyways! Henrietta has yet to catch it (THANK goodness!) but should I move mom and chicks outside of the coop? That means I need to find another hutch.
Any help on what I should do with this sickness?! It seems to be spreading like plague! Even though everyone is on Duramycin. At the way its spreading I may not have any chickens after long.