She doesn't make the comparison at all, quite the opposite.
She says what the US is running are concentration camps and I don't disagree. What she doesn't do is compare them to Nazi camps.
First, that line about Dachau or whatever is not hers. Second she makes the specific comparison elsewhere, like
here.
While she said that these internment systems are far from the extermination camps of Nazi Germany, she felt it was important to point them out as part of a dangerous continuum.
"Even Auschwitz rose out of exactly these other kinds of camps that we're discussing," she said.
"Let us not imagine what other unimaginable horrors we can't yet picture that could develop out of these situations that are happening in broad daylight right now."
Frankly once you've conceded the point that they are concentration camps, you don't have much of a leg to stand on in saying that comparisons to the Nazi camps are off limits. Indeed, to accept the term is to invite such comparisons.