I would just leave her be. She will want to go into lockdown and will not leave the nest at all for a couple/ three days - I have no idea how they do that either, but she will let you know. Just have the food and water there for her and let her be until at least day 24 of the setting. Sometimes you can hear the peeps of the chicks before they hatch. You just don't want to stress her.... FYI Sometimes hens are good at brooding but totally freak out when the chicks hatch and will kill them. That is because the hatcheries are breeding out the broody trait and it seems that the willingness to set eggs is the last thing to go.
Sorry for that heads up, but it is a possibility. I had one out of three broody hens that was a good mama. Good Luck with your hatch!
Sorry for that heads up, but it is a possibility. I had one out of three broody hens that was a good mama. Good Luck with your hatch!