Do you ever have trouble with the other hens kicking the broody out of the nest box? This broody is the lowest in the pecking order and my older EE who is on top kicks her out to lay.
Good point on candling, I don't think I could see through the barnie eggs, when my friend was hatching last year the green eggs were tough to see through as well.
No. I find that my broody gets up and that's when they lay eggs in her nest. 3 of them welcome the extra time out of the nest to walk about...one of them hurries back so fast I think the other hens barely have time to squat, much less lay. LOL One broody lets others lay in her nest, but she just moves over a bit to let them in. She's a little touched in the head, ya know.
What I found with my flock of broodies is if I move them to soon (before lock down) they abandon the nest. That's my birds. Every flock dynamic is different and your broody might welcome a quiet place away from the others to sit. Annie had a dog crate she put her broody in and covered it with a blanket, in the coop. Her hen liked that set up. Mine would go nuts wondering where their friends were and how come there were no new eggs in their nest.
Whatever you decide to do, do it at night. Many report moving at night cause the least amount of problems.
(My hens let me lift them up off the nest they are setting on to pick up eggs that don't belong there. I understand that that is very unusual. But my flock is very unusal. What can I say?)