My DD 10 throws flip change and finally getting good control and location. Her fast is in mid 40s and change is low 30s. So speed differential is very good. Her flip change has lot of back spin ( axis pointing dugout to dugout). quite often I see ball really moves like drop curve away from right handed batter. Her change up for the most part drops near the plate. My question is does this reverse spin cause problem later when her change up speed increase with age ?. I am worried that will the chnageup start hanging with increased speed. Any opinions from pros ?