Many artists through history have used their talents for propaganda. The best artists of their time worked on Catholic propaganda, Greek propaganda, Roman Propaganda, Egyptian propaganda...
I think we have to take their work as it presents itself.
That said, she certainly did glorify the Aryan myth beautifully.
To some, the pictures used during the FDR era were propaganda for communism/socialism which helped dig the US out of the depression. Fortunately/unfortunately the war did the real work.