i guess there are 2 sides to every coin...one a parent/player side, maybe they didn;t want to be on a team that played their DD in a non-desired position, or maybe they lost games, didn't reach certain goals, politics, etc...and on the coaches end, maybe they underperformed and were uncoachable...either way, you hope that the player can co-exist on one team and stick it through, but didn't someone who is more enlightened than i once say, "a girl has a right to change their opinion?"
more often than not, most girls leave because of their parents being unhappy....but it is in a coaches right to ask where a girl has previously played, even then, by the time they reach their tryouts, most coaches probably already talk and know one another so nothing's really a secret anymore