Maerz' work shows a birth date of 12/23/1781, however I believe this is the Christening date. I have no sure proof yet.
Sources
The Church of Jesus Christ of Latter-day Saints, "Pedigree Resource File," database, FamilySearch (https://familysearch.org/ark:/61903/2:2:SY67-HFM : accessed 2018-01-03), entry for Elizabeth /Voorheis/.
The Edward Ball family of New Jersey: a study, by Claudette Maerz. p 29, 30. Viewed online via ILL from UW-Madison, OCLC number: 34770265. call# 95-3607
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DNA Connections
It may be possible to confirm family relationships with Elizabeth by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Elizabeth: