I did some searching online to see what else I could find. There's a will abstract for John Burt "of Cumberland County," New Jersey, on ancestry.com that lists daughter Sarah "Rulong" and six sons: Noah, Richard, Daniel, John, Jesper (probably should be Jasper), and Moses. The will is dated March 25, 1798, and was proved on March 31, 1801. It doesn't list Susannah, so she must have died by 1798.*
This is all of the information I've been able to find about Susannah so far.
This post is part of the 52 Ancestors in 52 Weeks challenge by genealogist Amy Crow at No Story Too Small.
* the will abstract is from a digitized version of Documents Relating to the Colonial, Revoluntionary and Post-Revoluntionary History of the State of New Jersey, First Series Vol. XXXIX, Calendar of New Jersey Wills, Administrations, Etc., Volume X--1801-1805, edited and indexed by Elmer T. Hutchinson, New Jersey Historical Society, MacCrellish & Quigley Co., Trenton, New Jersey, 1946, 67