It seems like she was going back and forth there for a while. It is one thing to have your family lore or whatever and another to use what you know is a special category to arrogate privileged status. She was white when being white was advantageous and NA when that was advantageous, and now she seems to have gone back because once again America has shifted on this issue and now apparently "cultural appropriation" is the sin du jour.
But aside from her reprehensibility, it is her clumsiness that ensures she will never be able to beat TRUMP. Most campaigns can't survive even one apology, much less because with a 3 days apology tour. The DNA test as well was quite idiotic - what did she think it would prove and to whom? These are actions that can only lose supporters; they will never convince anyone who was already against her.
Her reprehensibility? Trump paid hush money to a porn star, sexualized his daughter repeatedly, bragged about grabbing women's pussies, cheated the students at his "university," cheated employees, cheated contractors, bankrupted multiple companies, had racist exclusions in his property dealings, hired undocumented workers, is clearly a racist, doesn't pay taxes on his earnings, married an undocumented alien yet is vilifying others who are doing what the "First Lady" did, and has gold-plated shit in his apartment. But Warren is reprehensible because she did something stupid and disrespectful 30 years ago?
If we don't have a strong candidate, Trump is going to win in 2020. That will be on the so-called liberals who are raking Warren over the coals for this bullshit.