That is terrible, I mean what Princess Diana said about her second son‘s intelligence.
How could a mother say such a horrible thing about her child, even if it were true? 🙁
She was, as a tween, VERY jealous of one of her older sisters, whom the then Charles, Prince of Wales dated for a bit, always VERY manipulative, and extremely STUPID. Like Harry, she barely managed to get out ( graduate ) from what we call high school and never did go to University. She threw tantrums,even as an adult, was bullimic and who knows what else.
And before you ask: WHY HER, FOR CHARLES?...the answer is that Charles's grandmother and Di's grandmother were BFF, they wanted him to marry one of the Spencer girls, and she was the only unmarried one left by the time Prince Philip went into high dudgeon and ordered Charles to GET MARRED NOW!