No heating pad on eggs before giving them to her,
just store them at room temperature(60-80°F) until you give them to her.
Decide where you want her to set and hatch,
and move her there now with some fake eggs.
Moving her well after full dark might be easiest.
I like to partition off part of the coop(~4x4' space) with a floor nest,
so she's not bothered by other hens and new eggs aren't laid in the nest,
but she's still in view of the flock. Good idea to dust her and her nest with permethrin as broodies are susceptible to lice and mite explosions if they can't dust bathe.
She needs enough space to get up and eat, drink, poop(big stinky ones) and stretch her legs.
It may take her a few hours to settle back in,
they don't like change but if she's really broody she'll settle back in pretty quick.
Once she's sitting tight for a day and a night, swap out the fakes for the fertile eggs.