Jantje, born in Genemuiden, married (widow of Hendrik Sijbrants) Jan Noldus, son of Noldus Koetzier, 2 May 1800 in Ijsselmuiden (right page, top entry):
"Netherlands, Overijssel Province, Church Records, 1542-1893," images, FamilySearch (https://familysearch.org/pal:/MM9.3.1/TH-1951-35343-6243-6?cc=2037905 : accessed 3 February 2016), Nederlands Hervormd > IJsselmuiden > Dopen 1737-1813 Trouwen 1737-1811 Lidmaten 1737-1769, 1730-1771 > image 268 of 293; Nederlands Rijksarchiefdienst, Den Haag (Netherlands National Archives, The Hague).
Unfortunately Baptism Registers of Genemuiden appear to be unavailable online, so birth/baptism of Jantje can not be checked (yet).