I don't know what the old girls' problem is. I read that they might molt after a year of production, but they only produced about 6 months or so. They stopped laying after the massacre, but only for a day or two, and that was entirely understandable. They laid for a few days after penning them in. Maybe they're mad about their captivity.
I sure am happy for these eggs though. Goldie is producing those nice orange-y yolks that I've become