So the runner scored, and the batter (the sure out) was safe at first ?
Yes, but it was 2-1 with the other team leading late in the game and when my daughter had charged the ball she was closer to home plate and made a perfect throw to get her out if not dropped. The girl took off from third at the pitch so there was no “looking her back” which was the instruction.
The intent was to prevent the runner from scoring and tying the game so getting a "sure out" was not the issue.............
And "checking the runner" would only apply had the ball been hit to the left side and it likely would have worked.
However, the runner obviously had the go sign to break for home with the batter being instructed to hit to the right side........
The third base coach was right in giving the instructions to go, the girl's coach who told her to check and throw to first was wrong, the girl throwing to home when "checking the runner" was not an issue, was 100% right..........