DH is NC with his family and my parents are both dead. I don't have siblings and my aunties/uncles were all NC with my mother
This is what jumps out to me.
I know being ‘no contact’ with family members is very normal on MN. But I don’t know a soul who’s no contact with their family. And I have a wide and varied set of friends and family.
Maybe that makes me the unusual one. And I acknowledge that I’m privileged not to have experienced it. But it does strike me how common it is on here, but how unreflective of my real life it also is.
If you’re NC with close family, then yes, you will be isolated from people. And it also suggests (I fully admit, possibly incorrectly) that there is some issue with being unable to resolve difference / agree to disagree. I can see that might be impossible if you have toxic family members. But again, some people do seem to be disproportionately affected by this, at least on here.
OP, you have asked for opinions, so I am going to give mine. I do think your situation is unusual. I feel sad for your daughter that she hasn’t had friendship modelled to her, and now she is alone. Except she is currently even more alone than you; at least you also have your DH.
However, me being sad shouldn’t mean anything to you, or her, if she’s perfectly content with the situation.