Well, that went well.
I have now officially begun introducing my new pullet to the bantam/broody coop. I got Pidge about three weeks ago, basically four days after I gave broody Summer her eggs. Well, Pidge was only about ten weeks old to begin with so I wanted her to be a bit older for introductions as well as get the eggs hatched and make sure the chicks were healthy before letting everyone see each other. Well, the babies are now two and three days old and Summer is a seriously mellow broody. And poor Pidge was lonely. She actually tried to get into the coop when I had let her have the run for the day. Guess she could hear Summer and the babies.

Pidge is now in a cat crate in the coop. Everyone can see and hear everyone else but no one can reach anyone else. Summer doesn't seem to care, at least not after Pidge was in the crate. Boy did she and I get the Broody Death Glare when I was holding Pidge though! If looks could kill...
I figure I will keep them like this for a while before full introductions begin. Anyone have a recommendation for a good age for the chicks to be at before I remove the crate from the equation?