She unironically said the problem with Hitler is that he had aspirations outside of Germany. That if he just wanted to make Germany great, no problem.
So basically, the Authoritarianism, the mass murder, the loss of freedom, all of that was fine. The real problem was that Hitler ALSO did that stuff outside of Germany.
It's a common tactic of the Alt-Right. Whitewash the Nazis while also making it clear that you're not a Neo-Nazi. The Alt-Right does it on YouTube all the time.
That's not to say Owens is Alt-Right, I don't think she is. I think she's just trying to appeal to the Alt-Right like Trump does.