Wow! She certainly wants her calcium! I'd say to let her eat all that she wants, especially if it's her hormones telling her that she wants extra calcium. It sounds like you have a good control on no egg making (separate play times, etc.), so it might just be a question of riding it out.
Bethany and Jorge
Mini schnauzer, Watson (July 18, 2009)
Budgie, Sammy (April 13, 2014)
RIP Príncipe Pío