She would have been a difficult mother-in-law no matter who her sons married.
My first question goes to both Camilla and Charles marriage, will that ever happened? He was a widow, so there was nothing on its way to marrying again but Camilla's own divorced status. Especially given he is going to be, someday, Head of The Church, a divorced remarried head of a church? Well, Henry VIII did that, but we are not in those days anymore.
Then, regarding what you said. She was a piece of work in more than one way, that we can all agree, but their children managed to keep a good memory of her because she was
a good mom. However, she didn't get to be there during those very difficult teen years, I wonder how that would have played out... Especially with Harry. Charles did manage to be there, and get them in line, again, especially with Harry.
It pretty much depends on how things ended back in 1997, having she finally married Dodi, losing her status altogether, got to be less interesting to the media, and finally accepting that or going nuts about not being cared anymore. It's either one of two scenarios.