I have never heard of this woman. Could you tell us more? As to the slave owning blacks most were slave owners of their own family members. A free black who bought his wife or son etc. The reason they remained slaves even though it was largely in name only (let us not get off topic about the slavery of women in the 18th & 19th century please) was due to the laws governing newly free slaves. They had to leave the state unless they got government exemption (which was common enough here in Virginia) There were large slave owners who were black but they were not very common. The black owners of Melrose Plantation in LA were richer and had more slaves than their white neighbors but that was not very common as I said.
I don't blame people in the South for being defensive about their history. The libs want a one sided discussion and don't think anyone else has anything to contribute to the discussion.