I think it's difficult to know what she would have grown into, but I will never be a fan of the way the press & public need to have a figure to adore and a figure to hate. While living, a royal (usually the royal women, if we're frank) can be both in the span of a week's tabloid headlines, but her early death meant Diana got rewritten as an angelic figure, and Camilla was frozen in the minds of many as the evil other woman.
Both women are and were actual people, with flaws and good points, and I will never get my head around the idea that we need to see them as cartoonish figures of good or evil.
The same is repeating with the current generation - Kate is for the most part the "good" royal woman, though the press will happily sell a negative story on her if it'll get eyes, and Meghan has Camilla's slot of being the "bad" royal woman.
There is a certain irony however in Harry's volatile reaction to his wife inheriting the press's role of a woman he then tried to shove back into that role via his own media.