An opposite view...... I'm a mediocre player who enjoys tournament golf and is well versed in the rules. From any bunker, I employ a different takeaway than I do for any other shot. No grounding, and a much steeper backswing. That makes the shot more challenging, but eliminates any possibility of grounding or "sweeping" of the sand. Anna took her normal swing, from which she obtained an advantage, but which violated the rules.
Bottom line, I think this was very unfortunate, but the right call. The only question mark in my mind is the timing of notification.
Jamey