What makes Marilyn Monore so special?

Watched Seven days with Marilyn Monore,found more information about Monore.although I studied her two films some like it hot,all about Eve during university time. I never understand her charm.after watching Arthur Miller's interview on YouTube, I know more about Monore . In Miller's eyes,she was still the abused child. She wanted to be rebellious but her old Her cannot accomodate the new Her. She felt constantly the condemnation from inside. In her,we saw uncertainties. Perhaps her charm came exactly from the conflicting forces she embodied and represented.