Actually, I do remember a diva moment in an earlier show. This actress was really abrasive and talked back to the music director. At home, I rehearsed with the practice music we set up, which was recorded with the correct counts. At some point I realized that we started slipping into a trend where it took us two measures to sing one particular measure.
When I realized that things were sounding different from my practice music, I asked the music director about it. She said that yeah we were way off, but it was easier to make the orchestra vamp an additional measure to give us time. The abrasive actress had successfully cowed the director into not fighting it. The change wouldn't be so bad except that it'd be nice to have a formal announcement of the change.
It's gotten to the point that I don't even want to see show with this actress in it. Her backstage shenanigans were horrid, and I don't know how she keeps getting cast.