Thomas Cowin's will is transcribed on the IOMFHS will site. His "loveing wife" is mentioned but no name for her and I've never been able to figure out who she was.

I just noticed that there is a gap in the children. First set go up to 1723 and the second set of 3 begins 1732. It's feasible that the 1730 marriage of a Thomas Cowin and Isabel Skillicorn belongs here and is a second wife for Thomas.

I see there's a burial of Isabel Cowin als Skillicorn in 1788 Lonan and a will too. This could be her. If it's her, she'd be quite elderly. However, I would think the alias would be Christian if that was her maiden name.

All very sketchy. The wills might help to figure some of it out.