Aghadowey
Sarah Fullerton was born according to Census 1901 in 1851 and was R.C. So her birth was pre registration
See Census
http://www.census.nationalarchives.ie/pages/1901/Donegal/Mintiaghs/Shandrim/1182137/However as far as I can make out the correct parish is Buncrana R.C. and their records start too late to get her baptism.
I have got her church marriage record in 1872 from Donegal Ancestry but it only gives father's surname but family lore is that her father was Alexander Fullerton also from Shandrim.
There is a pension search form of Census 1851 online that shows an Alexander Fullerton and wife Sarah in Shandrim but no family details are given apart from confirming that the applicant for the search an Alex Fullerton of Duntason Dumfries (sic) was found.
I had seen a Roots chat query about another Fullerton family in the same area and wondered if there was a connection or if somebody might recognise the family- all a bit of a long shot I'm afraid. .
annclare