I will never understand why a coach wants to take their best pitcher and have them pitch like their lesser pitchers. Sounds like at this point it would not only hurt your daughter but hurt the team's chances of winning.
Perhaps for now you can say you don't want to make any changes during the season, for the good of the team, but you'll look into it after the season. Then you can decide what to do depending on whether you stay or move to another team.