One quick question- Do you have a rooster?
Take the eggs out every day until she goes broody. You can't make them hatch eggs... they have to want it.
You'll know you have a broody hen when she sits on a nest all day and gets upset if you remove her. A broody hen will do anything she can to get back to her nest and does not like to be disturbed. She will "growl" at anyone who comes near her. Some are worse than others- I have a hen that doesn't mind being pet when she sits, but then I have another who will peck. A broody will also collect eggs that were laid by other hens. She will get off her nest and roll the eggs over to add to her clutch.
She will need to incubate the eggs for 21 days. She will stay on her nest most of the day, leaving for just little spurts at a time. When your hen goes broody, it's very important to make sure she has easy access to food and water (as in, put it right next to her so she doesn't have to leave her nest), and I've found that my broodies will eat more if I give them fresh veggies and fruit along with their normal food. A broody will pull her breast feathers out and loose weight from not eating as much.
It's also important that the hen is moved (at night so it's less stressful) to a place where she can have some privacy. I bring my broody inside the house and put her in a big plastic storage bin (no lid, of course) and let her sit there.
Once the babies hatch, they can live in there with momma. I never put a cover on the brooder because momma doesn't want to leave her babies but likes to jump on top of the brooder to flap her wings. She then jumps right back down to the babies. Trust me, you will not find momma hen wandering around the house!
Once the babies feather out a bit (about three weeks), I put them outside in their own area. I've found that mom is ready to get back to the single life after 4-6 weeks.
