My DD is one of the few, now, that has zero issues with slow pitching. She once was. I gave her ONE simple cue, "9u". In other words, go back to 9u baseball to where you didn't load until the ball was already in the air. It was the fast pitchers that ruled the mound because kids didn't know to start their swing pattern before the ball was in the air. Every now and then if a slow pitcher is on the mound, I'll just yell to her "9u!" when she's in the on deck circle. Everyone is different, but that one cue made all the difference for my DD.
Good post...