As Margaret Paton married 7 Jun 1915 as a widow aged 32, address Sefton House, South Promenade, presumably her earlier marriage was within the previous 12 years or so [and also her first husband's death - but not in Maughold].
Could they have married in the UK?
Her father was Thomas Smith, Engineer. This appears to be her brother's marriage:

7 Sep 1921 Alexander Charles Campbell Niven SMITH aged 22, Bachelor, Labourer, Residing at Mona Cliff, Sth Prom, Ramsey, Father: Thomas Smith (dec), Engineer, married Ruby JONES aged 20, Spinster, of Burlington House, South Prom., Father: Samuel George Jones (dec), Farmer.

Thomas SMITH aged 48 yrs of South Promenade, Ramsey, was buried 22 Jan 1904.

Thanks to Tom Corteen for these Maughold records.

Sue