I think she made a mistake indulging in Trump's lunacy. But now we're armed with the truth, for what good it does.
I dunno, overall, I don't see it as even being an issue. If this is the best they've got on Elizabeth Warren, then she'll run over Trump in 2020. We all, independent, Democrat or Republican alike, should be focused on her policies not on whether or not her native american ancestry has any meaning.
And as for Trump, he'll call her Pocahontas regardless of what evidence she offers.
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Hurr durr Marxism.
Ugh. Not even going to bother. Take this as a win if you want.