I would first try to stick them back under her where she made her new nest, but it's a long shot. Maybe she will hear them peeping and decide to stay put?
My only other thought would be to try to put together a makeshift incubator -- maybe a box with some holes/venting cut into it, set on top of a heating pad with a warm wet sponge inside, and saran wrap on top? I've never tried it, but maybe a search for makeshift or emergency incubators would yield something you could make at home. At the basics, an incubator is just a warm, moist environment. Maybe even a moist paper towel draped over the eggs in a warm spot might be enough. If they do hatch, you will need to brood them yourself, as your hen probably won't be interested in more chicks now that she is off the nest.
What a crummy position to be in. I hope it works out for you.
I would put them with her and see how it goes, if not put them under a light with a moist sponge near and pray