I would have refused to engage in any conversation on game day and would have asked the parent to leave the facility. If she elected to take her daughters with her, that would be her choice.
She'd be invited to discuss matters the following day, but based on what you stated, I would've had to remove the parent from our team. With this sort of drama in February, the team most likely would not make it to May in good shape.
I must have told her 10 times this was not the time nor the place for this convo, she kept going on and on and on then started yelling at me. That's what finally got me to my breaking point.