She could be starting but I wouldn't give any special eggs yet. Many hens are grumpy when laying & she may have just wanted some privacy. If she does goes full broody, you'll see a difference & she won't leave the nest for days. I'd leave some golf balls or practice eggs in the nest to see if it entices her. If the eggs are expensive & she's a 1st timer, I'd only give her as many as I'd be willing to risk and hatch the rest in the incubator. If all goes well & she hatches the eggs, you can always slip the incubator chicks under her after they hatch. Most hens don't mind if it's done at the same time as her eggs hatch.I have a question. I had a go and spend the night in the next box. didn't poop in it and would not let me collect the eggs from her, so I left them there. then she spends half the next day on them and at night goes to the roost instead of the nest. Is she getting ready to go broody or what? I have special eggs coming next week so that would be great if she would so i don't have to fire up the incubator.