Obviously because she's kicking off her campaign.
New York Times said:Senator Elizabeth Warren, the Massachusetts Democrat who is running for her party's presidential nomination, has apologized to the Cherokee Nation for her decision to take a DNA test to prove her Native American ancestry, a move which angered some tribal leaders and ignited a significant political backlash. The apology comes as Ms. Warren is set to formally kick off her presidential run this month after recent visits to early nominating states like Iowa, New Hampshire, and South Carolina. It also comes after repeated calls for her to apologize from tribal leaders, political operatives, and her own advisers, who said her October decision to take the DNA test gave undue credence to the controversial claim that race could be determined by blood — and politically, played into President Trump's hands.
On Thursday, Ms. Warren called Bill John Baker, principal chief of the Cherokee Nation, to apologize for the DNA test, said Julie Hubbard, a spokeswoman for the tribe. She called it a "brief and private" conversation. The apology was first reported by The Intercept. Ms. Warren's campaign did not immediately respond to requests for comment. "I understand that she apologized for causing confusion on tribal sovereignty and tribal citizenship and the harm that has resulted," Ms. Hubbard said. "The chief and secretary of state appreciate that she has reaffirmed that she is not a Cherokee Nation citizen or a citizen of any tribal nation." The apology is a break from Ms. Warren's previous public stance, where she refused to admit fault.