I’ve seen a broody hen get chicks out of a ten feet high hay loft, she said jump and they did, then bounced up and ran to her. I regularly have hens hatch chicks in a nest that is about three feet off the coop floor. They have never had problems getting the chicks down. They do not return to the nest to sleep of course, she takes them to a corner of the coop floor. The height of the nest is not an issue in my book but it really bothers some people to think about it.
One issue might be how big the nest is. I once had a broody hatch chicks in a per litter bucket with the top 7-1/2” x 11-1/2”. The top was about 3-1/2 feet off the coop floor. The first baby chicks that hatch often like to climb up on top of Mama. Mountain climbing can be great fun for them to reduce boredom while waiting on the later ones to hatch. I had to pick up chicks four times and put them back in the nest with the broody. That nest was so small the chicks would miss the nest when they slid off of Mama. I don’t have that problem with my other nests and this one has since been retired. So how close to the edge will she be sitting? That would be my only concern.
If you wish to move a broody I suggest you build a pen that is a real prison. You want to absolutely prevent her from returning to her first nest if she wants to and you want to keep other hens out of her nest. The area does not need to be very big, just room enough for a nest and some food and water. Broody hens should know to not poop in the nest and mess up the eggs but they have no compunction about pooping in food or water so be prepared to clean it some. It’s best to move her before you give her hatching eggs to see if she will accept the move, some don’t. Lots of people regularly move broody hens and usually don’t have big problems, but occasionally one really does not accept the move.
One issue might be how big the nest is. I once had a broody hatch chicks in a per litter bucket with the top 7-1/2” x 11-1/2”. The top was about 3-1/2 feet off the coop floor. The first baby chicks that hatch often like to climb up on top of Mama. Mountain climbing can be great fun for them to reduce boredom while waiting on the later ones to hatch. I had to pick up chicks four times and put them back in the nest with the broody. That nest was so small the chicks would miss the nest when they slid off of Mama. I don’t have that problem with my other nests and this one has since been retired. So how close to the edge will she be sitting? That would be my only concern.
If you wish to move a broody I suggest you build a pen that is a real prison. You want to absolutely prevent her from returning to her first nest if she wants to and you want to keep other hens out of her nest. The area does not need to be very big, just room enough for a nest and some food and water. Broody hens should know to not poop in the nest and mess up the eggs but they have no compunction about pooping in food or water so be prepared to clean it some. It’s best to move her before you give her hatching eggs to see if she will accept the move, some don’t. Lots of people regularly move broody hens and usually don’t have big problems, but occasionally one really does not accept the move.