Alison,
Tradition was to marry in the bride’s church. In this case that was Ballyphillip Church of Ireland, so that tells you her denomination. It could also be where she and her siblings were baptised.
I notice that the witnesses were William McDade (presumably her father) and a John McDade, perhaps a brother?
There’s a copy of Ballyphillip’s records in PRONI in Belfast. The records start in 1745. Personal visit required to view them. My guide to Church of Ireland records says that rootsireland has some years records. It does not say what years. Subscription site.
An Eliza McDade of Portaferry married at that same church in 1852. Her father was also William McDade but his occupation was shoemaker, which is odd. However I am pretty sure it’s the right family because Eliza Boomer was the informant at Eliza McDade’s death.
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1852/09428/5415443.pdf
She seems to have been widowed and remarried in 1892 at which time she gave her father’s occupation as schoolmaster.
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_re…
Eliza McDade (ie William’s wife) death:
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_retu…
A Mary McDade of Portaferry married at the same church in 1877. Her father was William who was a “process server” which is much like a bailiff, and so I’d say this is a sister to Rebecca.
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1877/11140/8079644.pdf
William McDade death in 1890. Occupation shoemaker.
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1890/06108/4743705.pdf
Info from the Rosdavies site:
Eliza McDade daughter of William McDade ; married Philip Boomer of Portaferry 23 Oct 1852 (regd. Portaferry) & 21 Nov 1852 at Portaferry Catholic Church; bpt. 21 Nov 1852 at Portaferry Catholic Church ; mother of Catherine bpt. 18 Sep 1853 & Michael bpt. 4 May 1855 at Portaferry Catholic Church
http://freepages.rootsweb.com/~rosdavies/genealogy/SURNAMES/Mc/McD.htm
William McDade and Eliza Cassens marriage appears to be before the start of statutory registration in Ireland in 1845, so it isn’t on-line. You might find it in the Ballyphillip Church of Ireland records.
