No, your giving the flock association to much credit. It's just a chick. Getting more chicks may or may not help that one. In my experience it helped my upset chick to calm down and enjoy the group. But wanderlust is a whole other thing, IMO.... though it might not be so worried about getting out anymore if it has a few friends to console it instead of maybe only the sleepy or distracted one.They have some dirt. And I've hand-fed the mealworms...so they've had maybe 3? between the both of them. I did give them a bit of cucumber to peck at for interest.
I also have come into an interesting scenerio.
Is it possible they think the baby is part of their flock? I took them out for an afternoon play time and plunked the baby down. She's 8mo and not yet mobile. They get close, but not too close. The RIR didn't even try to run once. Baby would get excited and flap her arms, and both would make crazy circles and flap around. The louder she "talked" the louder they cheeped. When I had to put them away the baby let me know I'd made a mistake and lost her mind....and so did the PR.
They are getting drinks and playing now. Baby needs a nap....but the RIR is fired up again, ready to run.
So...do they think the baby is part of their flock? If so will getting 2 more solve that...or are they bonded to her?
Other times RIR's escaped or had wanderlust, baby was no where to be seen (napping/bed)
In all groups one may be the big adventurer. I have a large flock 40-50. One of my birds (EE) insists on inspecting every inch of my acre and some of my neighbors to. And like I said, monkey see monkey do. Someone has to lead the way to adventure. If your weather is decent (sunny and not windy) you could take them to the real outside for a few minutes. Earlier in their life is best.
But that wanderer girl has curtailed her adventures to my own property shortly after she started laying. I didn't clip wings to keep them on this side of my 4 foot fence, because it wasn't a real concern for me. When they do go over it is usually where there is a solid gate to land on instead of my stock yard type fencing.
Beings they are flock animals.... more chicks is better .... I guess is my final thought. Won't be long before it isn't really safe to have the babe like that. Chickens LOVE to peck shiny things like eyeballs. And it really isn't something you can train out. They peck at lint and whatever else they can get their lips on.... when they are little no big deal. But it hurts when they get bigger. A couple of my girls are gentile though.
One thing that won't help you or the chicks is if the toddler rules the roost!
Like with anything else though.... what work for one person at one place might not work for another in another location. And ultimately you have to do what you think will work for YOU!
Now go get some chicks and don't listen to what people say about chicken math!