Unfortunately she had the wool pulled over her eyes by her primary subject. Eichmann was absolutely every bit the monster you'd assume for the Architect of the Holocaust. He played up being "just a functionary" incredibly well during Nuremberg, but if you look into his history, perhaps he wasn't as flamboyant as some of his contemporaries like Himmler or of course, Hitler, but he very much held similar views.

This is not to say she got it wrong, I think the banality of evil absolutely holds up in a number of readings of historical events. I just don't think Eichmann was a good example.