If your broody's stopped being broody, then she's stopped being broody. You're not going to persuade her to pick it back up. Are you certain she was broody in the first place?
If you're not sure, candle the eggs. Put them in a dark room, hold a light so it shines up through the blunt end (If you have a good flashlight, make a loose fist, put the flashlight's head in your fist, and put the egg on top of the flashlight.) You should be able to see veins or development.
If you see nothing, then either she just started sitting a few days ago, or there was no incubation at all. I'd just collect new eggs and put them in the incubator after you've worked out the settings and how to keep a constant temp.
If you do see movement or vein growth, (or you're certain she was broody) then you have developing chicks. Theoretically, you could keep eggs alive under a heat lamp. Get a thermometer and keep them warm at between 99-100 Fahrenheit. It helps if you have a temp-steady room. You probably don't need to supply humidity, but if you want to keep a few wet sponges around them--
not touching--it might help.
EDT:
How to candle eggs
And also, putting a blanket over the eggs that are under the heat lamp might help normalise and evenly distribute temps.