Good vent...feel better?
Sounds like a difficult situation. I've never been faced with a game admin interfering in such a way. But you're correct. She has no business going to the visiting coach during the game. And you are definitely right to report her behavior, especially coming into your dressing room, to your supervisor and the state association. I kind of wonder if she has some type of acquaintance or relationship with the visiting coach.
Don't hit anything. Just relax, flip the remote and get your mind off it before hitting the hay. After all, tomorrow's another day!