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Maria married Malise 5th Earl of Strathearn in 1268.1 (Malise 5th Earl of Strathearn was born about 1210.)
"In 1268 he married, as his fourth wife, Mary or Maria, daughter of Ewen of Argyll, and widow of Magnus, King of Man. She survived the Earl and became the wife of Sir Hugh Abernethy of that Ilk.' He died before 1293, and his widow married William Fitzwarin, an Englishman, who died about 1299. She herself died in 1304-5.
e-books, The Scots Peerage ed. Sir James Balfour Paul vol. 8 (1911).