Can you put some wire mesh around the nesting site of the broody, or create some makeshift partition so no other hens will be able to interfere?Sadly im going to put the chick down but just right now another chick hatched and now what do i do as soon as one has hatched
And after the hatch you could move the mama with her chicks to a safe place on their own.
Perhaps you could post some pictures of your setup, but try not to disturb the broody during the hatch.