Hen wants to be a mom, how should we prepare?

[Phantom_k9]

If you are not willing to mark the eggs and look under her every day after the others have laid to remove any new eggs I'd suggest isolating her for the rest of the incubation. It's not a case of feeling under her, you need to look at the eggs and remove any that are not marked. With my nests I might raise her up so I can look but often I set the broody on the coop floor. If she is truly broody she will go back to the nest either directly or after she eats, drinks, and maybe poops.

Bad things can happen if you don't remove extra eggs. They may build up to a point that she can't cover then all or you may wind up with a staggered hatch.

If I can catch her while she is down, I'll number the eggs. I'll also try to attach a picture here of where she is sitting.