My single chick is now 10 weeks and living with the broody that raised her, in a semi-mobile outdoor pen. She's the size of the bantams now, maybe not the bulk yet but hopefully enough that the cats will see her as one of the flock rather than a stray sparrow to stalk

and I'm thinking of letting them out so I can re-use the pen. The hen is laying again so could do with layer pellets rather than chick crumb and grass etc from where I can shift the run to day by day in 2 sections, but it is a bit early for the chick to have them so am I better keeping them separate a few more weeks til they can both have layers and the chick is a bit bigger still?
The other hens and cockerel are often around the pen or on top of it, so they have been in contact with the chick for the last few weeks and I am hoping that will help integration as I don't want her bullied either.
What age do you put your young pullets in with adult birds? I've just the one and she's not friendly so I don't want to make a mistake letting her out too soon and trying to catch her again!