I would say that Riefenstahl was seduced by financing for her movies.
As for Winifred Wagner - a charming woman whom I met - you could not be more wrong. Yes, she was in love with Hitler, but she threatened the life of her own daughter, Friedelind, when Friedelind ran away to Switzerland to disassociate herself from the Nazis. As a result of the death threat, Friedelind left for England and spent the war in a camp for enemy aliens, while her family lived it up as favorites of the fuhrer. I know for a fact that until her dying day - decades after the end of the war - Frau Winifred kept a portrait of Hitler prominently displayed on her dressing table.
WW gave an lengthy interview in the mid-70s and said that if Hitler walked through her door right there and then she would greet him with open arms. But it’s an open question of how much she shared Hitler politics. She claimed that she expressed her disgust with Kristalnacht to Hitler directly and helped a lot of Jewish performers at the time.