There is good reason to believe that Kay knew her eggs were no longer alive. The info below shows that researchers have found several kinds of birds communicate with their embryos in the shell.
Golden eagles also make special sounds during breeding season and baby eaglets even peep to their mother while they are still in the egg.
http://www.auburn.edu/communications_marketing/askaubie/101806.html
Some birds also vocalize to mom while inside their eggs, the researchers say. And so they speculate such acoustic communication at an early stage of development may be a shared behavioral feature of past and present archosaurs, a large group of animals that includes today's birds and crocodiles along with the now-extinct dinosaurs, pterosaurs and early croc relatives.“As birds also produce embryonic vocalizations that induce parental care,” they wrote, “such acoustic communication at an early stage of development may be a shared behavioral feature of past and present archosaurs.” Archosaurs are an ancient group of reptiles now represented by modern birds and crocodiles.
The study, detailed in the June 23 (2008) issue of Current Biology, was funded by the French Ministry of Research and the University Institute of France. © 2009 LiveScience.com. All rights reserved.