I hope it is clear now that the Rosetta van Bengale with will CJ 2609:6 1739 is NOT the same Rosetta van Bengale that was married to Jan (Johannes) Jansz van Ceijlon and had 5 children with him.
She died in 1769, widow of Jan Jansz van Ceylon, liquidation & distribution a/c MOOC 13/1/7:4 1769-1770. According to her will of 16/10/1769 (ref MOOC8/13.23), she was married to Jan Jansz van Ceijlon and they had 4 children and/or grandchildren listed as beneficiaries: Johanna (Anna?) Rebecca, Appolinia, Johannes Adriaan en Maria Juliana. A fifth child appears to have died childless before 1769, he is not mentioned in the will (baptised 1746, 12 June, Hendrik Jan).
The CJ 2609:6 1739 Rosetta van Bengale married her former slave Aron/Arend van Balij, she was childless and Jonker van Makassar and some/all of Rosetta van Java/Boegies's children were beneficiaries in both her 1739 will and their combined will in 1747 CJ 2658:48 1747. She was connected to the Jonker family in that she was Jonker van Makassar's wife's former owner and their families obviously remained close. The Jonker children were beneficiaries in her wills and Adolph Jonker stood surety for Aron/Arend van Balji her former slave and husband to manumit a slave of his that he wished to set free.
H.C.V. Leibbrandt: Precis of the Archives of the Cape of Good Hope. Vol 16, Requesten (Memorials) 1715-1806 Vol 1 A-E: 1742 Aron of Baly, free black, wishes to emancipate his slave Corydon of Bengal ; offers as surety himself and the Burgher Adolf Jonker. (No. 32, p5)