Try giving her someplace with a very deep moist substrate to encourage her to lay. If that and the increased heat/soaking does not help very soon your lizard will need to see a vet.
When a lizard is truly eggbound it means that the eggs are fused together in her abdomin. It is impossible for this mass of eggs to pass normally. In this instance veterinary assistence and probobly surgery is mandatoy ASAP. Eggbinding can cause serious problems and even death if left untreated. Good luck with your lizard.