I should have added, that I just looked at Frances' Manx Notebook, and found the marriage of Stepen Kewley and Catherine Skillicorn in her "missing" Lonan marriages. The time is certainly right, given the birth of Stephen Kewley's first child, but, that doesn't constitute proof.

As far as Catherine Skillicorns, in addition to daughter of John, there is also a Catherine, daughter of Philip, April 3, 1828, and a Catherine, daughter of James, at Lezayre, October 18, 1782.