Finally I was able to get the karate teacher to e-mail the board breaking video. And no G didn't weaken the board with all of her attempts. She really surprised herself when she did it too and in her words, "I tried not to smile" after it broke.
Because it was sent so late (that is my term because timing wise couldn't have come at a better time) G's cousins got to see it along with her grandparents! And had I even thought G would be able to do it I wouldn't have had run down batteries!