You are in a tough spot. Getting innings is important but having players ahead of her may her push her both in the circle and in other positions. If you believe the coach will give her innings it may be best to go with the team that will force her to compete more for playing time. In 12U we had 6 pitchers and all pitched through pool play and most during bracket. Everyone was getting innings every weekend and it was a win win for the team as a whole. Pitchers got experience and the top two stayed fresh for deep bracket runs. I would say all 6 could have found a home and been a number 1 for some team but the rotation worked.
How often did you guys play and what type of format were the tournaments? With 3gg, you had some very special parents and coaches to keep everyone happy. Most tournaments we will be in will max out around 12 teams.