The same hen will be on the nest day and night, will pull eggs into the nest if she can (as with an open or community nest) and will be very reluctant to leave, even when fabulous treats are offered the rest of the flock. She will fluff up and may peck if you try to move her or collect the eggs (though THAT behavior is not unique to broody hens). Whether you leave them or not depends on what your plan is... chicks? Eggs? If you're not ready to deal with chicks right now, take away all the eggs as many times as you can during the day, take her off the nest. Put her up on the roost at night, and you may want to block off the empty nests at night if she goes right back. (You're going to feel like an old meany!) If that doesn't work and you really want to break up the broodiness, put her in a wire cage with air circulation UNDER her (with food and water, of course). There are some other threads on this site which may have more strategies. Good luck - it's tough to go against mother nature!