I'm not sure either but have it in the back of my mind that he doesn't keep fillies going beyond three.
Banks Hill, Intercontinental, Timepiece, Passage Of Time and Midday were all G1 winning mares of his kept in training that come to mind. Obviously Enable goes into her own category and he has retired plenty at 3 also.
Johnny G drawing dead if she raced in blue with white epaulets.