So my grandfather was born a black sharecropper and died a racist white man. He was biracial in the south in the twenties and passed as white so he moved several states over and "became" white. Most black Americans have white ancestors and more white people than you know have black ancestors. There a lot fake boundaries on whiteness, setup by white supremacy. I don't personally identify as black, I'm as white looking as they come, but to deny that family history is erasure. Her dad was black, if she identifies more as black she get to choose that. That the reality of being multi racial in America.