This is the correct parents and duplicate profile for Maartje Louisa Jooste (van Heerden)
Maartje Louisa Jooste
Looking at this profile as it is now:
Looking at the profile of the mother https://www.geni.com/people/Anna-Sophia-van-der-Merwe/6000000001634... she died in 1774 there's a Maartje mentioned on her "inventaris"
Maartje oud 5 jaren; (birth would then be 1769)
The father https://www.geni.com/people/Pieter-van-Heerden-b1c1/600000000138951... died August 07, 1785 according to his profile
Maartje married to Frans Daniel Jooste would have been born after the death of above mentioned parents as her date of birth is calculated to be November 1798 from her own probate record.
It therefor seems to me that although they had a daugter by the name of Maartje it can't be the one married to Frans Daniel Jooste.