This is a rotten dinosaur egg.
She races everywhere with the challenge, "Last one there is a rotten dinosaur egg!" Then speedy as a rocket, she beats us all and announces triumphantly, "I win! I'm the rotten dinosaur egg!"
Yes, she's got it all a little mixed up. But it's too cute/funny/innocent to correct her. Besides, she's so stubborn, I'm not sure she would believe us if pointed out that the loser is the rotten egg. We've been enjoying Mary the super speedy rotten dinosaur egg for several months now. And she's just so dang proud to be a winning rotten dinosaur egg.
She sure is a cute one.
P.S. Another Mary matter: If you would like Mary to share something with you, say, a bite of ice cream or an M&M, she insists that you say with "magic word." Which is "I love Tinkerbell and Tinkerbell loves me." This is utterly humiliating for David--but sometimes he really wants that bite of ice cream or M&M. So they compromise. David can say, "I like Tinkerbell and Tinkerbell likes me." They are tough negotiators, those two.