Warren identified herself as Native American. That's more specific than just claiming to have some ancestry.
Having a Native American ancestor at best six generations back (which would make her 1/64th Native American) would not justify listing her race as American Indian on a state bar application, contributing to cookbooks of Native American cuisine, or being listed as a woman of color in law school directories.
https://www.cnn.com/2018/10/15/polit...can/index.html