Thanks for everyone's input. I read and thought through every comment. The consensus is that she should quit when she's damn good and ready. So onward we go.
To address some of the comments: she is definitely an overthinker, it is the first thing every new coach notices. She always tries to be perfect. That's why I stopped taking video of her, she'd obsess with every detail. I signed her up with a mental coach (hooray, more money!) but it is too early to see much from that.
The muscle imbalances comment was also on the mark. She's always been sort of "muscle-bound." It wasn't long ago that she couldn't extend both her arms straight over her head. Her bicep also can get so stiff that she can't fully extend her arm. She's been adding some stretches to her workouts that seem to be helping. She probably throws around 500 pitches a week, which I don't think is terrible. But there is also overhand work, hitting, lifting etc. and I worry about overuse. But then I also worry that practicing less is just going to make accuracy that much harder to fix.
There is another aspect that I wonder if anyone else has seen before, because I've never heard anyone talk about it. It is as if practice makes her worse. The best way I can explain it is she will be practicing and after a while, she might start missing in one direction. She'll try to adjust, but sometimes the adjustment makes things worse. So she tries another adjustment etc until she can't do a damn thing. It's like she unintentionally ruins her mechanics with 1000 tiny cuts.
I think I will try to post some video soon and see what you guys think. Thanks again for all the advice.
To address some of the comments: she is definitely an overthinker, it is the first thing every new coach notices. She always tries to be perfect. That's why I stopped taking video of her, she'd obsess with every detail. I signed her up with a mental coach (hooray, more money!) but it is too early to see much from that.
The muscle imbalances comment was also on the mark. She's always been sort of "muscle-bound." It wasn't long ago that she couldn't extend both her arms straight over her head. Her bicep also can get so stiff that she can't fully extend her arm. She's been adding some stretches to her workouts that seem to be helping. She probably throws around 500 pitches a week, which I don't think is terrible. But there is also overhand work, hitting, lifting etc. and I worry about overuse. But then I also worry that practicing less is just going to make accuracy that much harder to fix.
There is another aspect that I wonder if anyone else has seen before, because I've never heard anyone talk about it. It is as if practice makes her worse. The best way I can explain it is she will be practicing and after a while, she might start missing in one direction. She'll try to adjust, but sometimes the adjustment makes things worse. So she tries another adjustment etc until she can't do a damn thing. It's like she unintentionally ruins her mechanics with 1000 tiny cuts.
I think I will try to post some video soon and see what you guys think. Thanks again for all the advice.