The following suggests that she was b4, not b7
Jacques Mouton] of Steenkerken [Steenwerck?], Belgium. was divorced from Catherine l'Hermite who was remarried in Europe to Pierre le Roy. He [Mouton] had three children with his first wife, that is Jacques, Antoine and Marie-Jeanne. They remained in Europe with their mother.
He also had three children with Marie de Villiers, of La Rochelle or Guines, France † ca 1699. She is possibly the Marie de Villiers born on 9.11.1673, and baptised on 12.11.1673 at Guines, France as the daughter of Jean de Villiers and Francoise Joing; x Belgium (Flanders)Jacques Mouton] of Steenkerken ,Belgium.
The children were Madeleine and Marie (who was born in Middelburg, The Netherlands) and Marguerite who was born on board ship. They arrived at the Cape on 20.7.1699 on board the Donkervliet. His wife (Marie de Villiers) died either on board ship or soon after their arrival, because he is described in [official ?] documents as a widower.
He married a third time on 8.10.1700, to Francina Bevernagie. He is the progenitor of the South African Mouton family and was among the early residents of the "Land van Waveren" (Tulbagh).
Juna Malherbe and Alet Malan, compiler, Genealogy of the DeVilliers Family in South Africa (Franschoek, South Africa: Board of Trustees, De Villiers Publications Fund, 1999), Page 877 http://www.e-family.co.za/ffy/g5/p5194.htm