Madamez, rape, child abuse and statutory rape (ie sex with an underage person by someone much older) all still happen nowadays and would most definitely warrant breaching this so called "duty of confidentiality" everybody thinks teacher have. What has increased is the amount of casual and unplanned sex among very young teenagers. The pregnancy stats for that group are also rising, whilst in groups it is falling (although the conception rate does not appear to be falling as fast); for me this is a clear indication that due in part to increasingly early menarche, girls sexualising their behaviour at increasingly early ages (13-15 is the group I'm thinking of), in line with societal expectations and messages.
If girls and boys did not think that sex at 13 was normal, if they were allowed just a couple more years' childhood (ie not thought to be adult at 11 as 50% of the parents questioned in a recent study stated), then maybe the conception rate in that group would go down again. Because in my years as a teacher, I have never met a 13 yr old who was to all intents and purposes an adult, and they sometimes need (often) need protecting from themselves. They are still children, who need their mums, and all the support with growing up that they can get.
To go back to your original "argument" then. Teachers would ALWAYS breach confidentiality in cases of abuse and rape- that is their job. Not to do so would place a child at unacceptable risk and let them down at a crucial time. Children who go to teachers for this reason mostly know in their hearts that they cannot keep it secret no matter what they have been told by the abuser, and no matter what they tell the teacher.
Very young teenagers who are having a pregnancy scare not through abuse are often way too young to know what to do and want help. The teenagers who confide this kind of event to teachers are not the organised ones able to take themselves off to FP clinics or their GP by themselves. They are the seriously scared ones who are unsure what to do.
Maybe this story was not this woman's to tell. Maybe it was wrong of her to pass it on to the parents. I don't know, as I don't know the ins and outs of the case. I can only say what I did in a similar situation some years ago. But maybe this girl has been saved from a very young pregnancy or ST illness by this woman's actions.
Maybe we should not all be so quick to judge without knowing the facts.