Many children - particularly neurodivergent girls - are quiet because they shut down internally rather than having explosive outward meltdowns. It doesn’t mean they are happy or that all is ok.
As I said earlier, sometimes the tactic of the teacher taking the child in helps them get over anticipatory anxiety. If that’s the only barrier, that can be a good strategy.
However, it doesn’t work for all kids as it’s often not just about getting into class, it’s about managing while you’re there. And for some kids, for various reasons, it’s too much.
In your other comments you sound like you’ve scoffing at mental health and masking.
Imagine a really tough day at work: you’ve got to do a presentation to the board. You’re not very good at it, you don’t know what’s going to happen. You’re anxious and a bundle of nerves. The whole day you’re in a state of high arousal, living on your nerves. You can’t concentrate on anything else because you just want to get the big presentation over with. You do it, and go home. Exhausted.
Then tomorrow, you have another day just like that. And the next day. And the next. And so on.
It’s not sustainable.
That huge, exhausting day is what school can be like for some children. Every day.
No one can exist in such a high anxiety state for a prolonged period of time. And they certainly can’t learn productively while they’re using all of their resilience to just get through the day. That’s masking. It’s exhausting when it has to be performed so extensively and maintained for a long period of time.
We should help our children to overcome short-term anxiety and learn how to conquer difficult things.
But we also need to recognise that humans aren’t a one-size-fits-all breed. Neurodivergence and other conditions can mean the school environment doesn’t work for some children. Schools do their best but only have finite resources. School is designed for the masses, not the few who don’t fit in.
Incidentally, home education started to grow en masse in the 1970s. It existed before, it always has, but was more isolated. So as you’re nearly 70, it’s very possible you didn’t know many home educating kids. But my dad was your age, and he simply truanted, as did many of his friends. Technically “at school” but very much not present. For years. No one would get away with that today. Different eras, different approaches.