Her demographic is Khoisan. Khoisan are their own category. There aren't many of them around because of the pastoral society that they live(d) in but they are not "Black" Sub-Saharan Africans.
I don't care what "black historians" more interested on creating a cultural narrative than actually delving into the truth. She was captured, she was abused, that was wrong. But she was not Black African.
I'm not sure why you are struggling with the idea that language is important, commonality of languages is one of the reasons we know that Bantu speaking tribes came from the Congo delta region.
Our species spread across the world from its African heartland about 60,000 years ago – but 3000 years ago, some humans went back to the homeland
www.newscientist.com
Do you have a problem understanding that these people are not Black but blonde haired Melanesian?
For several years, blond hair was attributed to Caucasians but the Melanesians of Solomon Islands are one of the few groups with blonde hair outside Europe
www.google.com