I think it would be indeed more likely (based on the dates + the baptism where Gerritjen Gerrits is a witness) Carrie was right and she was a granddaughter, daughter of Barent Kunst and Gerritje ? So I think it's save to keep her attached but now as daughter of Barent and you can of course mark the parents as Uncertain for now ?
Here's some info from this thread, they also mention a child Jacomijntgen Barents Kunst
Jacob Dubois b10/09/1661 married his first wife Lizbeth Vernoy b1662 m03/08/1689, d 1690. in Kingston
They had one known child, Jacomyntie Dubois.
Widower Jacob married Gerritje Gerrits Van(nee Nieuwkerk) Kunst b 1669 (It was her second marriage too. She was the widow of Barent Jans Kunst).
It has been suggested that their first child "Barent" was named after Gerritje's deceased first husband.
Barent Dubois b05/03/1693 then married his older half sister Jacomyntie Dubois b1889/1890 on 04/23/1715. She was the only issue from Jacob's first marriage with Lizbeth Vernoy.
(One other fact jumps out. The only child of Barent Jansen Kunst and Gerritje Gerrits (nee Neiuwkerk) was a girl who was named (just to keep us confused) Jacomyntie Barents Kunst.)