presumably you know the familysearch.org resources which led me to
https://www.findagrave.com/memorial/23376116 this has further information, is a good introduction to Sarah Wallace Alexander;s marriage and children, and has added notes by Carol (Farmer) Cunningham showing Sarah’s genealogical entry as part of a family tree on page 66, with another addition, a shadow sideways bust of Sarah added by Tom Nichols
Sarah Wallace Alexander Perry
BIRTH 1768
Newry, County Down, Northern Ireland
DEATH 4 Dec 1830 (aged 61–62)
BURIAL Island Cemetery Newport, Newport County, Rhode Island, USA
MEMORIAL ID 23376116 · View Source
She was born in Loughbrickland, Newry, Down, Ireland in 1768.Is related to William Wallace of Braveheart in Scotland. her marriage to Christopher Raymond Perry
1761–1818 has a full list of children etc
Aghaderg civil parish is where much Loughbrickland information will be filed under in records rather than Newry
Our unigue Ros Davies Co Down website
http://www.rosdavies.com gives Loughbrickland Aghaderg 20: 11/41 a village 4km SW of Banbridge; brick means Bricui, a character from local legend ; or from breac meaning 'trout' ; click here for a photo and more information OFN p x; NCT; OGSLL p38; V12 p1 3,4 , 9,10, 11,100 OSM: BIH p 8;DR; PNNI V6 p 14, 54,56
Loughbrickland House Aghaderg . just N of the town; in Coolnacran townland; residence of Nicholas Charles Whyte Esq. in 1836 & J.J. Whyte J.P. in 1886 V12 p 10 OSM; old b/w map F6; PNNI V6 p 21; POD
Loughbrickland Lake Aghaderg . there is an ancient crannog or man-made island in the lake; it was surrounded by a row of stakes & contained pottery, iron slag, bones & charcoal; a house used to exist on the island which was used by the Magennis clan; 3400 English troops killed a group of 60 rebel soldiers here in 1642 BIH p S; BCT p 26; IPP p 38
from her name listings
Robert Quin ALEXANDER Esq. Aghaderg of Loighbrickland; father of a daughter b. 25 Dec 1841 Freemans Journal
Robert ALEXANDER Esq. Aghaderg of Coolnacran in 1846 POD
from the 1823-1837 Tithes Applotment Books based upon the index work of the Irish Genealogy Hub’s listing for each parish in Northern Ireland, the originals are in PRONI Belfast the single line entry will disappoint many but still very useful
Wallace, John-Townland: Derrydrumack Year: 1828-Aghaderg-Down
Wallace, Samuel-Townland: Lisnabreague Year: 1828-Aghaderg-Down
from ancestryireland.com buy credits
SARAH ALEXANDER 17-- JOSHUA Down Could be her fathers entry
its possible her emigration as a ship passenger is recorded in
http://www.dippam.ac.uk/ied/