Coach was wrong. He should have gotten on his 2B, not her. Your daughter is preparing for 18/u, high school, college etc. Thats where the play should have gone. Don't sweat the coach, just keep making the right decisions.
How about getting on both the 2B and the 3B? One failed to cover a bag, and the other failed to have the presence of mind to recognize that and threw the ball in the outfield.