I don't have an answer for your specific question re Margaret McLaughlin (b: 1853/4). But I cannot but wonder with the several McLaughlin families living in and around Roxborough, Stormont in that period, that there may be some connection between them and your Margaret however tenuous. And I would feel remiss if I did not reply to your posting.
My great-great grandmother was Ann McLaughlin (b about 1824) who married Thomas Holland in Crysler, Ontario (1836). Family hearsay and some documentation suggest she was sister to Daniel McLaughlin (c 1823), Morey McLaughlin (c1832) and Hugh McLaughlin (c1818) who also lived in Roxborough.
Daniel had a large family. Married to Ellen Driscoll (c1867). The children were:
William (c 1870) (twin)
John (c 1870) (twin)
Mary (c 1874)
Stephen (c 1879)
I don't have any info on the families of Morey and Hugh McLaughlin. But looking into their family history might turn up something interesting for you.
George W McLaughlingeomcl@comcast.net