Her understanding of economics is predicated on her only looking for data that substantiates her polemical ideology. She bases her arguments on economics on the post-World War 2 growth period and attributing the economic success of those times to high tax rates while effectively discounting the myriad of other factors that played a greater role.
But in that she is only demonstrates a tremendous lack of insight. It is her lack of human decency that is far more troubling.