Stuart,
I have since found Mary Ann McDowell (nee Davidson)'s date of death and have a transcription of her death certificate. She died 13 Jan, 1916 at Merrylands Rd, Granville, NSW. Other details on the death certificate are: age 88 years; born Guildford, Ireland; 60 years in NSW; Father: Unknown first name Davidon of unknown occupation; Mother: Bessie Warburton; married Belfast, Ireland to John McD; Children at death: Eleanor 61, Mary 59, Samuel 57, Susannah 51, John 50 and Louis 48 living; 1 male & 2 females dead; Informant: Robert McKenzie Meldrum, son-in-law, Victoria Ave, Chatswood; Died of strangulated hernia, cardiac failure; BUried 14 Jan, 1916 at Methodist Cemetery Rookwood by rites of Methodist Church.
Her death Notice in the SMH Fri, 14 Jan, 1916 which can be seen on the Trove website.
Thank you for replying to my post.