You're totally missing the point here.
You're writing as if child justed happen to be on medication that they'd sought for themselves, prescribed in normal circumstances, and the school happened to know about it. But, that's not what happened here at all.
It's important to recognise that both the parents AND senior management at the school told the teachers the child should not be socially transitioned.
A small number of teachers decided they knew best and went against the parents and their management to actively facilitate this child starting transition.
The child isn't being seen by a specialist service, nor by her own GP, but by a GP who is happy to prescribe testosterone to teenagers. Fuck knows what their motivation is, but if they're like the GP near me who does this (or even the same one, perhaps) then it'll be because they're a true believer in gender ideology.
The teachers know that this child has been put on a regime that may leave her infertile and in menopause in her 20s, indeed they have facilitated it.
This isn't the same as not telling parents a 16 year old is on the pill. It's such a huge betrayal of trust, not only if the parents but of the girl herself. They are letting their belief in this new religion severely cloud their judgement.
I hope the parents sue the arse off them.