My favorites are the classic "just let her hit," "play catch with Susie" and "slow it down a little and let's get it over the plate." I feel your pain. I love it when the parents/coaches are on board.
"Slow it down a little" drives me nuts..... The faster and smoother my daughter moves, the more control she has, its when she gets out of line that she loses control and velocity.
I especially have the comments from the other teams, "well she can throw hard but doesn't have control" or "I don't see why they want to teach the to throw hard without control" Fact is... she is 8, her control gets better every day, but she is 8 years old, and the really fast pitches are the ones that end up being over the plate and strikes, or balls that are close enough to draw a swing.
My daughter tends to thrive on those comments when she hears it, but people who don't know what they are talking about should keep their mouths shut... I especially don't want the advice, but it would be nice if we can not make snide comments about any of the young girls.