If I remember correctly, she claimed to be part American Indian. She was not.
Bill Clinton once claimed to be part American Indian. He was an Honorary member of the Cherokees. No Indian blood in him.
A lot of people, including myself, can claim some Indian ancestry. We may even, as I do, have some documentation for it on both my mother's (Lenape/Delaware) and father's (Cherokee) sides. But when it's so far back in time no tribe will recognize a person as a tribal member. I've certainly never claimed any benefits for two hundred year old accidents of birth. What Warren did was out and out fraud.