There are no records for Sarah Arthur in Aghadowey Presbyterian Church. Baptisms only start 1855, the first surviving Communicants list is much later. The Stipend Lists do go back to 1820s and I have already checked them.
John Arthur (1796 Ire.-25 June 1879 Norfolk, Ont.), weaver, Cah, m.(c1830) Elizabeth “Eliza” Moore (1809/c1813 Ire.-15 Dec.1884 Canada).
1. John Arthur (c1843 Ire.-aft.1901), farmer, m. Sarah “Sal” Moore.
2. Robert Arthur (1832/c1834 Ire.-9 Sept.1883 Windham, Norfolk, Ont.) m.(18 May 1859 Canada) Anne Hope.
3. William Arthur (18 Dec.1835 Co.Derry-15 June 1919 Canada), farmer, m.(1865 Stratford, Perth, Ont.) Elizabeth Hunter.
4. Elizabeth Arthur m.(1 Apr.1863 Coleraine Registry Office) Archibald McMaster.
5. Sarah Jane Arthur (c1841) m.(24 Dec.1870 Brandt Co., Ont.) Thomas Logan.
6. Margaret Ann Arthur m. Robert Summerville.
7. Samuel Arthur (c1844/17 Apr.1845 Ire.-14 Feb.1919 Downie, Ont.), farmer, m.(2 June 1873 Perth Co., Ont.) Mathilda Hunter.
8. Thomas Arthur (4 June 1850 Ireland-14 Jan.1929) m.(13 Jan.1886 Perth Co., Ont.) Elizabeth Henry.
“John Arthur had an older daughter named Sarah who came to America in 1854. She married Thomas Logan in 1870. My records, obtained from members of the Logan family, show her birth as 1841. This would make her 13 years old when she travelled alone from Ireland. The story is that she met a lady on the ship who hired her and she worked in New York for this woman for about a year and then proceeded to Ontario where she lived with her uncle Thomas, until she married Thomas Logan in 1870 making her age 31 at the time. Her first child was born in 1872. Her husband was three years younger than she was.” (family letter, 1999)