This may be nothing ... but stick with me on this explanation.
One of the witnesses to your mother's marriage was an Agnes Fleck, who I would assume was a friend and likely of roughly the same age.
There is a birth of an Agnes Fleck in 1906, the daughter of George Fleck and Agnes Turtle in Ballymena. Agnes Sr. and George were married on February 6, 1901 in Ballymena. On the same page, but married on March 13, 1901, was the marriage of James Reynolds and Agnes Fleck. Both were married in the Presbyterian Church in Buckna, parish of Racavan, Co. Antrim. James' father is noted as William James Reynolds, farmer, of Roughan.