| Religion | Presbyterian |
| Occupation | Nurse |
| Address | Violet Town, Victoria |
| Marital status | Single |
| Age at embarkation | 26 |
| Next of kin | Father, F C Mackay, Violet Town, Victoria |
| Enlistment date | 6 December 1916 |
| Rank on enlistment | Staff Nurse |
| Unit name | Australian Army Nursing Service |
| Embarkation details | Unit embarked from Sydney, New South Wales, on board RMS Kashgar on 2 September 1916 |
| Rank from Nominal Roll | Sister |
| Unit from Nominal Roll | Australian Army Nursing Service |
| Fate | Discharged 28 June 1919 |
| Miscellaneous details (Nominal Roll) | *second given name two spellings May and Mary |
| Family/military connections | Brother: [977] Lt William Gordon MACKAY, 8th Light Horse Regiment, returned to Australia, 3 July 1919. |