You are doing everything right. This one just may be a cull.I'm not sure... her comb really hasn't started to develop or redden that much, and the roos haven't been interested... but perhaps a bath wouldn't hurt just to be sure. She feels very empty back there, so if it's egg binding, it would have to be way up in there and not knocking at the door, so to speak.
All the other chickens are perfectly healthy - even Lady Silvia Runnybutt...
(knocking on wood)
