"Most parents in the vast majority of cases are supportative of their children regardless of their views on their children's decisions"

And you know this to be fact because you have conducted a survey? Sadly a large number of children do not have the same view as you. As someone who works with teens, myself and my colleagues have all been trained in child protection, and rule number one is that if a child has chosen you as an adult to confide in, then you don't betray that trust easily. Ask yourself why this girl turned to staff at her school and not her parents. Of course parents should be involved, in an ideal world, but as this story is very sketchy on the finer points, for all we know this girl could have been at risk of harm in such circumstances. It's probable that this girl was just referred to the Brook by school staff, and they took it from there. Without the full details however, it's hard for any of us to pass knowledgeable comments.