Ek skryf maar in Engels.
I Found a photo of Cecilia Catharina Louisa Botha (Born Botha) in the photo's of Cecilia Catharina Louisa Erasmus. Her Mother was Martha Louisa Botha, Married to Pieter Willem Erasmus. Martha Louisa was born 16 Oct 1845. The inscription on the back was amended by her grandson, My wife's grandpa to read that she was the ancestor of State president PW Botha, via Abraham.
With all this information at my disposal, as well as the fact that this Cecilia catharina Louisa Botha is the Daughter of Martha Louisa (which fits nicely with the afrikaner naming convention of naming the first daughter after the mother's mother) it seem like Martha Louisa Botha should fit in here.
Is your list of children exhaustive? I would not like to bugger up Geni if it is.
Greetings
Muller du Plessis