Females will dig many holes before they actually due lay there eggs. If she seems nervous or stressed, she may not be happy with her nesting site. Check to make sure the egg laying medium is deep enough, warm and moist enough without being too hot or too wet. If she is still eating, then she probably isn't ready to lay eggs. Typically a few days before they are ready to lay eggs, females will stop eating completely. Just make sure she is well hydrated. If she doesn't lay in a week, take her to a vet. The last thing you want is for her to get egg bound. If she seems to be trying to lay eggs but straining and nothing happens, take her to a vet right away. A overly large egg or just a stuck egg in the oviduct can rupture inside of her and risk killing her.
Clutch size may taper off a bit after several clutches but it isn't guaranteed. Bearded dragon's won't stop laying eggs or have smaller clutches for the convenience of their owner. The potential number of babies a dragon can have in one season is something you should have discovered when researching breeding your dragon. If she came to you gravid, then all you can really do is either spend the money to make sure you have enough cages for anywhere between 40-100 eggs and hatchlings, or freeze the clutches you don't wish to hatch, then dispose of them. Freezing the eggs will kill the eggs quickly and painlessly. This is best to do as soon as they are laid. The eggs should be frozen for a few hours to ensure they are good and dead. We don't want baby dragons hatching in landfills only to suffer a painful death of starvation or by birds.
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PHLdyPayne