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This. Even when we're looking beyond their appearance, the young dead will always be revered. Take Kurt Cobain. His music was absolutely incredible and his social views were ahead of the curve to a point where they are easily applied to today's day-in-age. Realistically had he survived the 90s we would likely have a slew of less than quality projects and some cancelable actions/words/behaviors following him around.
She didnt grow old and age horribly like Madonna.  There are no ugly pictures, no stupid instagram posts to judge her.
Any/all celebrities who die young will be overvalued and overpraised.
She's 'rated' by the standards of her day because that's all there is to look at.