life is a what if. I can only speak from my own experience hatching 50 to 100 broody chicks a year. What if she is moved and breaks her brood and all of the eggs go to waste? What if she hatches them all? life is a what if.
Probably 20% of my broody's hatch from high places. All it takes is a few minutes of preperation on the flock owners part to ensure the babies can't easily fall out. A 1x6 at the edge of the nest. A box propped up hardware cloth a few of the things I have used over the years to stop chicks from falling out.
There isn't one blanket answer for anything. But when time and time again I see my girls do these things over and over I can with good faith suggest the suggestions I make. As I hatch A LOT of broody chicks a year.
Johnn, that is of course your choice. If moving works for you fantastic. For me leaving things be unless I ABSOLUTELY have to intervene works for me. Different flocks, different people, different flock dynamics. Different experiences.