To understand someone's actions and the consequences of their actions is the only thing that matters when dealing with people like that. It's not denying reality to reject her cynical manipulations either.
Then couch it in that context.
"While she's not wrong, she's only using this language to sow dissent..." or whatever else the talking point is but let's start from the basis of evaluating whether or not what she said is true, we can follow up with addressing "why" she said it.