I just found this... which makes me wonder if there might in fact be two different "Elizabeth Klinkenberg" who married two different men named "von Horn"... (leaving the correct spelling of LNAB completely aside, for the moment).
*an Elisabet, child of Wellem Klenkenbergh & Jannetye Klenkenbergh, was baptised on 21 April 1736 in Bucks, Pennsylvania, United States. This CANNOT be the person who married Barent Barentsen van Horn on 25 January 1725 in Philadelphia.<ref>
'''Baptism''':
"Pennsylvania and New Jersey, U.S., Church and Town Records, 1669-2013"<br/>
Historical Society of Pennsylvania; Philadelphia, Pennsylvania; Historic Pennsylvania Church and Town Records<br/>
{{Ancestry Sharing|7699855|7b22746f6b656e223a2252532f6f6b2b636638313378796f4f70624e595045434c6f6177484d6e346d64594550436e47785a6b4e673d222c22746f6b656e5f76657273696f6e223a225632227d}} - {{Ancestry Record|2451|2020047330}} (accessed 14 November 2023)<br/>
Elisabet Klenkenbergh baptism on 21 Apr 1736, child of Wellem Klenkenbergh & Jannetye Klenkenbergh, in Bucks, Pennsylvania, USA.
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a baptism recorded in the "Church register of the Low dutch Reformed Congregation at Southhampton, Bucks County 1737-1880" on 11 Oct 1741 for Johannes, son of "Barent von Hoorn and Elizabeth Klinkenberg" would seem to match "the person who married Barent Barentsen van Horn" - somewhat better. The question remains whether this was the daughter of the "Wellem Klenkenbergh" assumed to be the author of the will signed by "William Clinkenbird". Another baptism, in April 1746 for an unnamed child of "Barndt van Horn" and "Elisabet Klinkenbergh" (image 2007) would also seem to match - given uncertainties in spelling.