The explanation/clue/answer is in your comment (Interracial) means exactly that! she is Indian despite the color of her skin if she has sex with a Black/African man, Oriental man,White man or Latin, she is doing interracial only if she is having sex with a Indian man despite his shade is she not ! Indian people range from literally white to brown caramel olive skinned to dark skinned never the less they are all Indian!!
And actually if you look at people from Africa and of African decent that most people would look at and class as Black or members of the African race they are not all the same shade either but are of the same race and are considered to be.