Nice coach, but have been told by parents (current and past), dont even come close of raising an issue with any issues related to the team nuff said.
Suggestion: "Coach, DD has been taught NOT to pitch the ball down the middle of the plate. She has also been taught to get as much movement on a pitch as possible. If you want her to challenge our hitters, she'll be more than happy to pitch BP. But she will not just throw the ball down the middle. If this is going to be a problem, then she won't be pitching for you. You are the coach - but I am the parent not only paying for pitching instruction but health insurance for her."
Sometimes you just HAVE to be the parent...even if it results in conflict with an idiot...