Frank,
You have my sympathy. I was the weird parent who applauded for both teams at baseball, hockey. basketball, etc. Maybe if a $31 million dollar contract was involved, I would take it more seriously. But at 9, 10, 11, whatever, every kid needs to be encouraged. Mandy sounds pretty level-headed. And she is hearing the right things from you. Mrs. Coach needs to get a life. Don't let her keep you from enjoying the game.