Was she mated?
If she was its about 30 days from mating to laying generally. It depends somewhat on when during the cycle the female was mated.
If the eggs will be infertile, its hard to be sure when they are due. The best advice I can give you is make sure your husbandry is good and that you provide a place for her to dig in her cage so she can let you know when she is ready to lay. The minimum size that the container should be is big enough when empty that she fits into the container with a couple of inches to spare on all sides including above and below her. I fill the container with washed playsand and moisten it so that it will hold a tunnel but isn't sopping wet.
A female will often stop eating or at least slow down just before she is ready to lay. She will likely drink more, roam the cage looking for a spot to lay, may bask more.
If she shows signs of lethargy, sleeps low in the cage, eyes begin to sink in or anything else that might indicate failing health, get her to the vets because it might mean that she is becoming eggbound.