I wouldn’t recommend it.Would it be worthwhile saying that she didn't want her skills impacted by his improper instruction?
I certainly don’t disagree with why she feels the way she does but finding a way to deal with the adversity and rise above it will make her look a whole lot better to a college coach than calling her high school coach out.
If she doesn’t play high school and a college coach asks she’s better off saying something like she is using that time to take private lessons to become a better catcher or something.
But before she quits she should try talking to the coach and see how that goes.