Hi Lynn
Did you recheck the nest for any new eggs? If something happens to the first eggs, females can count and will replace the eggs through what is known as double-clutching. The problem with double-clutching is that a female birds lose approximately 30% of her energy levels during egg laying. Now, your bird may be exhausted or further stressed. This is why we tell people not to remove any eggs. If eggs are not viable, the female will leave the nest on her own.
Now, if she has more eggs, you will need to leave the eggs until she knows they are not viable. If she feels the slightest heart beat, she will continue sitting.
If there are no eggs in the nest and she is still sitting, then once she leaves for eating, we would suggest you remove the nest so she does not return. The Regal Swan