thank you! She will be a first time mama. She is also my little baby we have 8 chickens 1 rooster but she is my princessEggs take 21 days to incubate and hatch, assuming they are fertile. It's not uncommon to have them hatch on day 20 or 22 either. I generally move my broodies to their own pen while they sit. Every flock is different, every mama is different, I separate mine to avoid any drama and tragedies. She is calmer as no one is bothering her, the chicks are safe until they are big enough to know to get out of the others way. Usually the broody will be even more stuck to her nest just before hatch, she knows they are coming. If she is a first time mama, then she bears watching, just to make sure all goes well. Most of them do a very good job, occassionally you get a bad mom. Always a good idea to have a back up plan (brooder) just in case.