The first time I had seen enough sexual behavior from Lucy to question it was here. Lucy was barely two then, and unlikely to be bearing eggs.
Surely an egg couldn't be there that long. Physical problems have just come up recently. Otherwise she has seemed healthy. We do think it's the second egg that might have brought all this on.
UPDATE: Here's one from 3/3 of 2005. Her motions then were just the same as those on Saturday evening.