Hmm... I didn't have rich parents but then my Dad died when I was a teenager and my Mum married a rich dude so I've experienced both. In a lot of ways I miss how life was before there was money. Mum went from a happy hippie chick to Disney villain toxic narcissist. To me money is like eating a delicious cake that constantly kicks you in the nuts.
This is obviously false. Personality disorders are caused by genetic factors and childhood trauma. You can't get one from a marriage unless something has gone very wrong with the age of consent.
You don't think a young mother whose husband died would be a big enough significant emotional event to cause any change in the mother? Making up other unknowns isn't really necessary.
It’s a child’s perspective of their mother’s personality, which is never going to be completely accurate. I don’t disagree with the larger point that medical terminology shouldn’t be used informally when it could be misunderstood, but a kid’s impression of their mom is always going to be at best a snippet of the truth.
I've thought about this a lot obviously because it has been such a massive theme in my life. I think you're probably right about genetic factors and childhood trauma. Money just acted like a sort of fertiliser for all the toxic seeds within her. I then started to notice that everyone else with money around us was the same. Just people pretending to be happy but actually being miserable. I've ended up being deeply suspicious of money.