Who taught her to pull both hands to her left side during the start of her pitching motion? Not sure I am a fan, but others may disagree. I prefer to keep things simple - a few pitches will probably not matter, but thousands of pitches over the years add up and that twist could lead to back problems. It also causes her to start her wind up off center.
JohnnyO just started a similar thread and I'd suggest much of the same studying for your daughter. It would be nice if I could say, "Here are 10 drills that will turn your daughter into a pitcher." Realistically, it really helps to understand why a drill does what it does so that you're not wasting time doing something randomly and without purpose.
With that in mind, here are a few of my favorite instructional videos and links. I find it amazing that these resources are actually free considering they are among the best I've come across:
I would suggest not working on one or two things but examining the entire motion and what her goals would be through the motion. Here are two comparison examples. You cannot expect a good outcome if things are so outside accepted norms at these positions in the motion. (I will clean this images up and make them smaller when I get a moment and figure out how)
What she really needs to do is learn how to *throw* (not pitch) the ball underhanded first. No one would ever try to teach someone to pitch overhand before she knew how to throw overhand. Yet, time and time again, there is some kid being taught how to "pitch" before she can throw underhand.
The "ball and glove swing to the left side before the pitch" is really bad. I've never seen any high level pitcher (or any pitcher, for that matter) do that. That movement is going to mess up the circle.
As already pointed out, drive mechanics are an issue.
MY DD is now a PC in Chicagoland...teaching IR of course.
Anyway, she says it is really fun the first time she tells a kid, "Don't do a windup. Just raise the ball to 12 and throw the ball to your Dad underhanded." The kid almost always resists and says, "I don't know how."
I'm OK with the both hands together but the problem is it's on the wrong side so she is crissscrossing over her body if you keep it on your throwing arm side it naturally begins your opening process.
Also looking at stills the big takeaways are Amanda is a foot off the rubber in the first, the second still is all about posture look how upright and tall Amanda is versus your DD bent over. Again she won't become a D1 phenom overnight but the proper mechanics work at any age and skill level.
Someone put stills of the Scarborough video I would use it along with other links people mentioned. Biggest thing I would not recommend from video is high backswing but there are tons of good mechanics there
Also looking at stills the big takeaways are Amanda is a foot off the rubber in the first compared to still on, the second still is all about posture look how upright and tall Amanda is versus your DD bent over. Again she won't become a D1 phenom overnight but the proper mechanics work at any age and skill level.