It looks like they got the husband wrong as well in the 1964 book. So you were able to go to the original church records to find out who she was? Are those online or would they be there in New jersey?

"Children of (6-467) JOHN S. DEMAREST and SUSANNA SINDLE or SARAH ---
7-942 ELIZABETH baptised December 19, 1807 married (?) December 14, 1844 at Pompton New Jersey Thomas (Van) Buskirk."