Like every teen I've ever known, these young people are struggling with 'who they are' and how they want to present to the world. What they look like, what views they have etc. etc. Plus many have additional mental health problems and / or are neurodiverse.
The thing about this is that there is so much heartbreak caused by these struggles in your teenage years, but once you get out into the adult world, no one gives a shit "who you are" or "what you do or think".
When I was in my teens, the subculture I was in was that intelligent, artistic young people had to perform a kind of angst-ridden and neurotic persona. One had to be "tortured" by life and existence. And there were idols for this neo-regency type of sensibility: Cobain was probably the most well-known, and Elizabeth Wurtzel was the scribe.
But once we all got out into the real world, it came as a shock to realise no one gave a damn how "tortured" or "artistic" or "brilliant" we were because the adult world wants people who turn up on time, do good work, and don't cause hassle or drama - - and most of the time, they didn't care about your ideas either.
It took quite a few of my friends over a decade to adjust to reality, and some never did. Now I look back and realise we were lied to by certain elements of culture throughout our teens and twenties about what the world was really like, and it has meant that we've wasted a lot of our potential.
So I'm afraid I see a lot of rapid onset amongst intelligent girls to be a very similar phenomenon. And I worry that it will, at the very best, waste years of their lives and, at the very worst, result in a medical situation that screws up their lives.
It's like we've learnt nothing.