it looks like there are more "Van Zyl" children added to her tree than what she had.
According to her death notice, she only had 3x living Children when she passsed away namely:
1. Gert Zandberg (with first husband)
2. Jacobus Johannes van Zyl
3. Hester Elizabeth van Zyl
Emma Theodora van Zyl
As she died in 1858, it will be impossible for her to have more children born in later years.
Maybe some of these children were connected incorrectly?
Just thought I will noticfy you as I am not able to contact all the managers directly.
Regards
Sophia van Taak.