Hey there,
Maybe this info will help.
First off, it is possible that the mating was not successful.
sometimes a few matings are necessary to insure a fertile mating. But, if they did it right =) then they could lay 3-9 eggs about two months after mating. To make a nest box, the old Reptile Hobbyist magazine says to use sand, or cactus soil, and make it just barely moist. You'll want it a little less than damp. Bury this box with the rim flush to the surface substrate. It also says to further entice the female to use this box, to put a few pieces of cork bark over it. You can do that, or just move her to a cage deep with barely moist sand. After a few days she will probably dig her nest, and then lay her eggs. She'll need a lot of water after she lays, so keep that in mind also. Dig the eggs out, but be careful not to turn them. Apparently, they are pretty sensitive to high humidity also. Vermiculite, sand and cactus soil are good substrates, just don't get it too wet. Keep the incubator around 80 degrees F. Eggs hatch anywhere from 60-90 days.
Rear the little ones like the adults, but be aware that they overheat faster than their parents. Good luck with your prospects!
yours,
Phil Clevinger