I expect she was disappointed by the ruling. She may have just wanted to keep him from having the tickets.
If I was judge, I would have thought seriously about making him deposit the tickets with the court, with a ruling to follow in a couple of weeks, at which point I would have given them each one of the tickets.
I expect that would have been her reason also.
If the child had a wish to go to the game with a parent, a normal other parent would have relented and not been so petty.
Anger, hate, frustration, inadequacy and self-doubt does a lot of needless damage. There is no reason by society as a whole has to enable it in the legal system, speciously for vengeful actions like this.