I mixed up a single bowl of mash a little while ago and watched closely when I put it in the run. I can definitely tell which pullet is at the bottom of the pecking order, because she hung back away from the bowl. And any time she got close the others would chase her away.
And I'm pretty sure that this is the same one that keeps laying eggs off the roost overnight. I got seven good eggs in the boxes today, and there was one broken one under the roost. It had some calcium on the shell, but it wasn't hard. But every one of them laid today.
So maybe that one isn't getting enough nutrition? Or it's just too timid and is always stressed out? Maybe adding a couple more next boxes would help.
At least, as a group, their laying is better overall. I don't see 2 or 3 or 4 soft eggs under the roost anymore, so I guess their internals are maturing and figuring things out. I'll just be patient.