Oh Kirkster, I'm sooooooo happy you found her! I just love it love it when miracles happen!
She should be just fine now, besides being a little cold & hungry. And now you know to keep them all confined together to let them get bonded to each other & accustomed to their new home.
I don't know what kind of coop setup you have but you may want to make them some sort of portable pen, a tractor, to allow them to enjoy the outdoor amenities while still being securely confined.
You can also begin training them to come when you call, there have been other posts about doing this. There's any number of ways, but basically get them conditioned to expect a treat when they come at your signal. I shake a little cracked corn in a can & call "heeere pik-pik-pik!". You don't have to give them much, you don't even have to give it to them EVERY time you signal. If you keep them guessing they'll be more likely to remain strongly conditioned to respond.
Learn from this lesson but forgive yourselves from all guilt, we've ALL made mistakes with the animals in our care. And thank you for sharing, you've helped us all grow smarter from your unfortunate incident, now new & improved with a happy ending!