The child had albinism. There are known cases in other African countries where people with albinism have been killed and their bodyparts been used for “witchcraft” purposes. (https://en.wikipedia.org/wiki/Persecution_of_people_with_albinism)

But it took a turn when prosecutors alleged that Smith sold her daughter to a traditional healer, who was interested in her eyes and fair complexion.

I think that implies that the child was literally butchered and its bodyparts sold.