Latino refers to people from Latin America, where - unlike in the US unfortunately - Native Americans have actually largely assimilated into the general population. 16% of Latino ancestry can be traced back to Native American genes, compared to 65% traceable to Europeans

https://www.cell.com/ajhg/fulltext/S0002-9297(14)00476-5
The link doesn't work because it automatically separates itself because of the "(14)", just copy-n-paste https://www.cell.com/ajhg/fulltext/S0002-9297 and then add (14)00476-5

But sure, attack her first and only then look up whether the idea in your head that she's wrong is actually true or not