If your DD gets a chance to show herself a little more, I'm guessing that the rest of the parents catch on pretty quickly, and when they do, it might not be pretty. 10U all-stars is serious business.
Are HC's kid and your DD the only 2 pitchers? If they are, either the HC rides his kid into the ground, or your DD will get plenty more opportunities.
Good luck to your DD in the next tournament. Keep us posted.