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McMordie was the daughter of shipbuilder Sir William Gray, of Hartlepool, County Durham. A Presbyterian, she was educated at Chislehurst, Kent. On 21 May 1886 she married prominent Belfast barrister Robert James McMordie; the couple made their home at Cabin Hill, Knock, Belfast.
In 1921 she was one of two women elected to the first Parliament of Northern Ireland, she represented South Belfast. She did not stand for re-election in 1925. In 1925, she moved to East Cliff, Budleigh Salterton, Devon, in order to be near her family (a son, John Andrew, and daughter, Elsie Gray). She was the first female High Sheriff of Belfast (in 1928).
|High Sheriff of Belfast