I'll respond. If you play for any competitive team, and you said that you have unquestioned knowledge of this TB situation, then the team has approximately 12-14 players. There will always be players on the bench of any quality team. It seems as if your dd is playing on a team of 9. LOL Maybe the other parents are good with you dictating the terms to your TB coach. I would not be and my dd would not be on that team. My dd played on some exceptional teams and yet, they never had a "star" who was above the expectations of all other players. Believe me, you need to stay on the team your dd is on.
If I can play Devil's Advocate- it doesn't sound like he's dictating terms to her coach. He's being transparent with another coach about what a situation would have to look like for his DD to play for him.
I'm always surprised at how many coaches feel like they are entitled to have really good players in roster spots 10-14, and then try and pull the loyalty/dedication/#trusttheprocess card to guilt kids and parents into filling those spots instead of going somewhere that they can play. Find kids who want to be in those spots and let the kids who want to play ball go play ball without calling them names or accusing them of not wanting to complete, etc. Maybe they just aren't that good yet and want to just simply get to play the sport?
12u teams shouldn't have 14 kids anyway, in my opinion.