Here is a reply I received from a duplex tree owner on ancesstry:
Subject: Sarah Duplex Dupleix
Hi My information as sketchy as it is comes from handwritten notes by Sarah Deborah Dupleix's daughter Charlotte Deborah Finney.
As written:
1st son-John Dupleix Jun born Sept 16 1813 died Oct 1813 buried in St Marys Parish Church Athlone
2nd son-Henry Drummond born Nov 25 1814 Athlone
3rd son-William born 25 Jan 1817 Athlone
1st daughter Elizabeth born Mar 31 1819 Athlone
4th son Richard born oct 4 1821 Athlone
? Anne Dupleix born Mar 14 1824 Ballylamon Kings Co.
Daughter Kathrin Dupleix born Aug 31 1826
5th son Robert Dupleix born Ap 19 1831 in Ballylamon (married Ann Seale - issue Sarah, John, Alicia)
Re-married - issue Richard, William, Charlotte, Harriet, Emily, Robert
So while it is not a definite birthplace it is a starting point as it took me a long time to be convinced of Ann & Sarah being one and the same person. I recently found in the 1901 census Canada stating Sarah Wilkes birthday as March 14 1826 & that was close enough for me to be almost certain that the Anne that my Great Aunt Charlotte has listed is the Sarah in so many Wilkes trees.
Hope that helps.
Lisa