ok i will lower it around day 20 then. thank youWow! That's pretty high up. I wouldn't mess with her too much now if possible. She will be getting down to eat, drink and poo unless you have her caged up there? If she's loose with eggs, the chicks usually stay right under momma until about the third day. That's when my girls usually take their babies out of the nest to the floor.
If you can provide a ramp, a ladder, or some way for the chicks to navigate down she will probably bring them down without intervention. Or of course you could lower the nesting area to around two feet and not worry about it. My silky chicks have jumped at a day old from the 24" height without problems.