I put my incubated eggs under my broody Bantam Cochins at lockdown so the hens could have the experience of the babies hatching out.
It's up to you what you want to do, but is their any chance she's not ''committed" to being broody then all of your chicks in the eggs would die.
Eggs will hatch too early in the hen's incubation cycle. More likely than not hen will reject chicks hatching only a week into her being broody. Waiting to add chicks after they hatch will give same outcome. Not a good move.