It would be good to take her out at least an hour before her lights are scheduled to go off, that way you can offer her a drink via eyedropper or syringe and let her warm up if she chooses to before the lights go out. Once they've dug their hole they don't usually take more than 2-3 hours to lay, usually less. They do sometimes just curl up in their hole and hide out, but they may lay the next day or 2 later....sometimes longer. If she gets very exhausted and just lays around, you'll want to get her to a qualified vet. An X-ray can show where her eggs are [ if she has some ] and whether she might need oxytocin to help her to lay.