I don’t know if this can help or add some insight.
But my daughter had a few girls at her school I’d describe as loners. Girls sadly without any real friends. We always taught her to be kind and inclusive and we had many a time that her and her friends would attempt to include one girl or another in their group if she spotted someone or knew of someone lonely.
Honestly she was like the patron saint of lost souls, and would even bring boarders home at the weekend, (after many approvals) if they had no friends and were constantly stuck at school.
The problems arose always in the girls behaviours. One for example always suggested getting drunk, early teens, another spoke about sex, in a way that was a bit show off and disturbing, many of them either tried to dominate everything, or got over excited and made it all about them, and so on.
With each girl the parents could not understand why their children couldn’t fit in.
Something I couldn’t say to them, but I thought then watching it over the years,, and I still think now, the issue was one of deep social anxiety with these kids.
They tried too hard to fit in when they got the chance. That they behaved in a way that was unsettling for the others. They behaved in a way that they didn’t behave ever in front of the parents.
If this was my kid I’d speak to them about how they interact when they are included. Show them how they show interest in the other kids. Genuine interest and show them how not to dominate conversations for attention, that showing off isn’t cool, that they don’t need to make shot up and impress.
Show them how to interact in conversation and let everyone have their say.
For me. Witnessing what I saw, there was always, always a very obvious reason. And often, as said, it was one I think rooted in social anxiety where the girl didn’t know how to behave with friends and simply couldn’t chill.
I don’t know if that helps, but I hope it does, because I think with the right parental guidance and gentle steering on social interactions any issues can be resolved. 💐