The bio of van_Staden-2 says there's a baptism naming both parents but no date.
The mother is Maria not Margaretha.
But the cited source doesn't say anything about a baptism or give any indication of which wife was Maurits's mother.
Margaretha has had several merges and comes with a choice of dates. I'm guessing she swallowed Maria, who was probably dead by 1677.
Seems like the book must be wrong in thinking Maria emigrated with all the kids in tow. Unless she was actually the last wife.