Maybe she knows she doesn't need anymore... I have 2 pairings, .1 Pewter x 1. Pewter YB, and .1 Bumblebee x Black Pastel Kingpin.
The pewters were paired late winter/early spring this year. She weighed in at 1,550g before she went off food and gave me 5 perfect eggs July 3rd.
The other 2 were paired Oct - Dec of 2014. After that they showed no interest in each other. She weighs in at 2,300g and just had her pre-lay shed last week and I can count at least 9 building in her. She hasn't ate the past 3 weeks either...