Coach Disqualification

[Scooby]

I had a coach disqualification that went poorly. Girls JV game that was fairly physical game. In the 4th quarter the visitor turn the ball over and then I have foul on the drive going the other way. When I was report the foul the visiting coach comes on the floor complaining that it was a foul on the turn over. She get her 1st T. She get louder and comes further on the court and complains louder. I finish reporting the foul and the 2 technical fouls and she head towards the exit.
We get the shooter on the line and I see that the assistant coach is standing and I tell her that there is no longer a coaching box, she retorts that the technicals were not on her. Now I see that the Head coach either returned to the gym or never left and is standing in the corner doorway. I get the AD and ask him have her leave. She yells the she is leaving and proceeds to cross the entire gym diagonally through the middle of the court and she received a standing ovation from the visitor's crowd and her players.

How could I have handled this situation better?