She reminds me of Velvette. I think they share the same VitC sculpt.
EDIT: As Andrea says, Velvette [Mbili Barbie] and Kwanzaa Barbie share the same headsculpt, which is named after its first appearance, Mbili. As far as I know, only 3 Barbies have been produced with the Mbili sculpt: Mbili, Princess of South Africa and Kwanzaa. Too bad, as she is my favorite.