Then that means that Ms. Pearl Duncan is not black/Afr-American.
I don't know how the African part of it works but for most college grant purposes the AmeriIndian part is worthless. You have to have one verifiable ancestor (usually a grandparent) on the rolls of a federally recognized tribe to claim AmeriIndian status.
(your tribe may vary. Check local listings for more details. Not valid outside of the United States. All sales are final. Do not use as door stop. )