Eric, with all the mentions of Margaret I think you have made a typo in her daughter's bapt. [Mary Ann, not Margaret.]
I have (all Maughold):
Edward Gelling / Margaret Stowell, Widower & widow, married 8 Aug 1835
Mary Ann d/o Edward Gelling/Margaret Stowell bapt 3 Jul 1836
familysearch.org/pal:/MM9.3.1/TH-1971-31006-14276-8?cc=1784428
? Mary Ann GELLING 21 Cornaa Mill buried 6 Feb 1861
[Too young? And I haven't checked the censuses.]
Sue