I agree that lower body mechanics are important. You can't pitch D1 without good lower body mechanics.
HOWEVER: Is this a kid getting ready to play D1? Or is she getting ready for a 12U-B team?
Parents can go down the rabbit hole of trying to perfect lower body mechanics before the kid can throw the ball.
Good lower body mechanics isn't going to compensate for poor upper body mechanics.
What we really need is a video of the DD so that we can see what she needs to work on.
Sorry maybe I should have explained better. My DD is currently first year 14u, she already goes weekly to a Pauly certified pitching coach who is great. She’s wrapping up her first year of hs ball but is in 8th grade (she started a few varsity games). Her lower body mechanics are pretty solid, but she needs more speed to get to her goals, she wants to play d1.
Im a big proponent of strength trading to fix mechanical issues. I find a lot of mechanical issues are cause by lack of strength, and are compensations for that. For example she had a problem with falling to the inside last year and just general lower body issues last year. We spent 3 months doing an intense body weight workout working on strength, and she’s not had the lower body issues since. I’ve seen this with other issues she’s had in the past too, we do lots of band work already, including a stronger front side.
Her walk/run through is 2-3 mph faster then her fastball, if that tells you anything. So I was just thinking of creative ways, I could get her to be faster off the mound, more like a sprinter coming out of the blocks. Her stride distance is good, she’s landing in the chalk of the circle, and she’s only 5’4”.
When you guys do long toss, you do it on days with no other pitching? How do those sessions go, do you just have her run through a regular fastball only warm up, then go into the long toss session?