Mary Catherine Mackay of Dartmouth Nova Scotia

I am looking for information on my GGrandmother, Mary Catherine Mackay of Dartmouth, NS. Mary was the first wife of my GGrandfather John Joseph Goldsworthy of Dartmouuth and later Middle porters lake NS. Mary and John had a son named Gerald John Goldsworthy. Mary died about 1918. She would have been about 20 - 30 years of age. She is possibly buried in one of the cemeteries in Dartmouth.