The only Amelias, born in Peel, and born 1865/6, to appear in the 1871 census and later are:

1871: Amelia Sayle daughter 5 Lower Market Street Peel
1881: Amelia Sayle 15 Servant 28 Castle Street German
1891: Amelia Cuthbertson 24 Wife of William J (or S) Cuthbertson 26 Tailor b. Scotland
1901 Isle of Man - no mention of town or parish: Amelia Cuthbertson 34 Wife of William J (or S) Cuthbertson 36 Tailor b. Scotland 14 Block B Pybody Bld Holborn RG13/ 236
Children are Douglas 8 b. IOM and Doris B b. Walham Green London

Brian's birth index has the marriage of an Amelia Sayle in St Andews Presbyterian Douglas in 1890 but gives no name for the spouse.
Finally there is a LDS submitted entry on the IGI for Douglas Cuthbertson son of William Tait Cuthbertson and Amelia Sayle on July 23 1892 in Douglas.

It does not look as though Martha survived as she is not in the 1881 census.