A Sarah Swords living in the townland of Ballylough in Tullylish parish married Daniel Cavit of Annaclone on 14 January 1842 in Seapatrick Parish Church (Church of Ireland, Holy Trinity, Church Square Banbridge), the witnesses were a Jacob Emerson and Mary Jane Walsh. Fathers not mentioned.
Someone called Jacob Emerson was also a witness to the marriage of an Elizabeth Swords to a Robert Elliott in Magherally Church of Ireland on 4 August 1845, Elizabeth was living in the townland of Tonaghmore in Magherally parish, her father was recorded as Hugh Swords, a soldier.
A Margaret Swords of Tonaghmore, Magherally, married a James Warnock in Seapatrick RC Church on 8 September 1851, her father was given as Hugh Swords, a pensioner.
And a marriage on 19 December (today!) 1861 was registered at Banbridge for a Thomas Swords living in the townland of Edenderry to Martha Beck, his father was given as Hugh Swords, a pensioner.
So just a possibility to consider is that Sarah was the daughter of Hugh. The following link shows the County Down civil parishes, note the touchpoint between the parishes of Tullylish and Magherally, if you click on each parish (57. and 67.) to show a map of its townlands, the proximity of Ballylough, Tonaghmore and Edenderry will become clear:
http://freepages.genealogy.rootsweb.ancestry.com/~rosdavies/MAPS/CoDownParishes.htmA few County Down references are at the link below, including the suggestion that Swords was an old county surname a.k.a. Crolly (and variants):
http://freepages.genealogy.rootsweb.ancestry.com/~rosdavies/SURNAMES/S/StuSy.htm The tithe applotment books show Hugh Swords in Tonaghmore, Magherally, the year was 1833. A 70 year old Hugh Swords was/is buried at Seapatrick, no other information available (not even date of burial).