Wow! My child was a school refuser in the very early 2000s, about 25 years ago - not the 10 to 15 years ago that you claim above @Idontunderstandmodernlife.
Her school psychiatrist said that it (school refusal) was not even a new phenomenon at that time.
It was in her second year at secondary school that my DD eventually had to give up trying anymore. I am almost positive that had anyone managed to convince her to try again, she would no longer be with us. She had hated nursery, and most of her time at infant and junior school, but she still struggled on until she was in her second year at secondary school. I was so proud of her, for how long and hard she had tried to fit in with our societies norms, and I am still extremely proud of her now.
My DD has gone through so much heartache since leaving school, and has missed out on so much of what many of us take for granted, yet she still perseveres, even though her life and living conditions are so restricted. She has tried all sorts of therapies and interventions, but she can't be 'cured' as she hasn't got an illness. Her brain is just wired differently.
None of the psychiatrists, psychologists, mental health nurses, or counsellors, who have met my DD have ever been able to come up with any other lable for her than 'Social Phobia'. 'Social Phobia' appears to be such a simple descriptive phrase, one that suggests a person has an irrational fear of socialising, and of actually living amongst Society. I, however, don't think that there is anything irrational about fearing what such a large proportion of the World's population has become. So, imo, there is absolutely nothing irrational about my daughter's fears.
For those of us who have witnessed, or experienced SP in our loved ones, or even in ourselves OP, it is terribly demoralising, and downright sickening, to read posts like your opening one yesterday.
When I started writing this reply to you OP, I was the first person responding to you, now it looks like you have had a lot more replies, so I will post this now, and then read all of the responses to your OP, OP, and your replies to them.