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This is kind of a loaded question in my area, I'm from NEO. First, please understand that most parents don't know what you are talking about, when you refer to IR. So try not to use that term, even when hunting for a pitching coach. However, what I have noticed is many coaches will instruct their students to do certain things when releasing the ball while pitching. They teach IR, without realizing it. We have one in our area. I'm not sure how old your dd is, but many players will have trouble just learning to toss the ball in for a strike. So IR is far from any thought at this point.
This past Sunday, I thought it was interesting, I saw an '04, not my own child, but another. I was probably 100 feet away from her, but she did have what looked like natural IR, I doubt anyone actually taught her that. But, maybe? She was a good big strong pitcher.
Another thing that happened that same practice is an adult was trying to get another pitcher to snap into the release. I could feel his pain. It's hard to teach, but it's a great way to get a little extra on the ball. If all you are interested in is IR, google it and you will be able to find other better video's on it. It may be less complicated than actually trying to hunt an instructor down who teaches it. There is an instructor with video's from SC. Good luck!