According to her age on her DN she was born 16 Aug 1760 in Cape Town and died 5 June 1836 in Cape Town
Her birth in Cape Town corresponds with the information on Wiki
He(her father) was fiscal independent from September 1741 to September 1762,[10]:438 and Secunde (deputy Governor) of the Cape Colony from December 1760 to April 1766 after Ryk Tulbagh had succeeded Swellengrebel as Governor.[10]:43,451,485 He returned to the Netherlands in 1766,[10]:59
On her DN: Married to Egbertus Berg (Esq?)
Geni: https://www.geni.com/people/Adriana-Sophia-barones-van-Reede-van-Ou...
DN - https://familysearch.org/ark:/61903/3:1:3Q9M-CSQJ-6Q8Y?i=1801&a......
On Wiki there's this reference - https://en.wikipedia.org/wiki/Pieter_van_Reede_van_Oudtshoorn
"Oudtshoorn
Ernestina Johanna Geesje, William Ferdinand's daughter and Pieter's granddaughter, married Egbertus Bergh,[31] a magistrate of the Western Cape town of George.[32] Bergh was one of the founding fathers of the Western Cape town of Oudtshoorn, which was named in honour of his wife's distinguished grandfather.[4][5][6][33] The coat of arms of the local municipality is based on the Dutch family's coat of arms.[34][35] Oudtshoorn is a twin town of Alphen aan den Rijn in the Netherlands which incorporates the historic Dutch villages of Oudshoorn, Ridderbuurt and Gnephoek.[6][33]"
Geni Ernestina Johanna Geesje –
https://www.geni.com/people/Baroness-Geesje-Ernestina-Johanna-Bergh...
DN:
https://familysearch.org/ark:/61903/3:1:3Q9M-CSQF-MSSG-Z?i=1720&......
Egbertus Berg DN confirms above mentioned marriage.
On Geni : Egbertus Bergh
DN: https://familysearch.org/ark:/61903/3:1:3Q9M-CSQF-CSW6-S?i=829&...
I've added all the death notices I could find to the van Reede van Oudtshoorn family.