He even went so far to say that she probably shouldn't play next spring.
Pitching aside for a minute, If this is a rec leaque the above comment is unacceptable.
Unless the coach thinks a girl is going to get hurt they have no right to express that opinion.
I would have a long talk to the coach and maybe the commissioner.
Pitching, if the above is the coach’s attitude your DD might not be able to break into the pitching lineup next year for their Team, even if she is the best pitcher on the Team.