Build the rapport with her parents.

There is nothing to be afraid of in that. They can then also see how she and you interact.

Good parents are your best ally. Because they will want to see their children being happy and improving as persons. And there is maybe nothing that is better at both things than a CLer in their lives.

Again, I am at the point where parents ask me, instead of the reverse. That implies trust. But the trust wouldn't have come without a rapport with the parents too, and without the parents seeing I make their children happier and better persons.

Of course there are also bad parents. And bad parents will not be your allies. But to know which are bad parents, you still have to build a rapport so that they can hang themselves. And in that case you can still use a hostile groomer approach and leave everyone still happy. Though this comes with its own problems and thus has its own set of tools.