That's a yellow card by the books... the girl went after the player and was very physical... she didn't even attempt to go for the ball. If anything... if anything it should have been a Red due to have aggressive the tackle was. It was shocking that a yellow wasn't give.
Who know if it would have made a difference in the game... BYU looked to have really tired legs before any of the OT's even started. But that ref should not be allowed to officiate a playoff match again. It was very bad form on the ref to not do his job.