My take is that she may be just be offering pie in the sky here. I did not see where she made the connection that Africans were the people that God was making those promises to.
Because of their forced dispersion throughout the world; because of their suffering.
Most of the bible was stolen from other beliefs and cultures. Who knows which people in whose story are originally referred to as chosen. What we do know is that the entire bible is based around Africa and the Middle East.