Label maker. Put the sticker between the forehead cushion and metal. Then I put a very small white tape on the mask sides so she can easily discern hers from theirs.
1. Side by side with another pocket radar.
2. Compare it with a Hitrax.
3. Does your local police department leave a radar trailer out near your street?
You already know what you need to do. You just want to hear it from someone else.
Leave. Find a team with the need of position that your DD wants to play.
What if it cannot be corrected? How long do you spend trying to correct it? What if things are worse in doing so?
Most of a pitchers practice will happen outside of lesson. Maybe 75 to 100 pitches are thrown in practice. You can watch and correct it. But 500+ are thrown outside of practice...
Embrace it. Use it to her advantage. Sometimes my DD's fastball is a drop curve. It throws off hitters.
If you really want to make an adjustment, I'd check her grip.
I use movie maker. It takes me an avg of 45min to edit one of my DD game.
I've been asked by other parents to edit their kids highlights. I'll do one for free. The next I charge money. I'll share my entire game recordings to them for free if they provide me with flash drive quickly.
Finish the season with this team. Practice/play with the new team now. With a few games left, tell the current coach that you will be going to a new team next year.