Senator Warren blundered badly with this whole DNA test nonsense. If she wanted to prove something, she really should have done it genealogically or documented a tribal affiliation.
Anyone who’s done genetic genealogy seriously, let alone actual non-biased experts in the field know that a conclusion of native ancestry from these results is extremely sketchy. They should have anticipated that the report would be quickly torn apart as there are a lot of other possible origins for the very few non-european sequences they found.
The native grandma myth is pervasive in American culture, and people claiming ancestry based on bad information from family is pretty common. This was a dumb fight to keep fighting.