Not helping finding Ann's arrival but an obituary for her husband.
http://www.rootschat.com/links/0yd5/The Riverina Herald 30 Oct 1917
OBITUARY.
MR. NICHOL MERCER.
Mr Nichol Mercer, an aged and respected resident of the Echuca district for many years, died after a very short illness al his home in Koyuga on Saturday. The late Mr. Mercer had been ill since Thursday when he attended the special sale of sheep and cattle at Echuca. He left apparently in good health, but on reaching home he complained of a sore throat, and sent for a doctor, who diagnosed the trouble as quinsey and heart affection. As he was not improving, the doctor was again sent for, but Mr. Mercer grew weaker. and died an Saturday morning.
The deceased, who was in his 83rd year, was a native of Melrose, Scotland, and came to Australia in the early fifties, following mining for some years, and latterly farming at Mount Pleasant and Torrambarry. He came to Koyuga in 1888, and had been there ever since except for a period of seven years which he spent in Echuca.
The late Mr. Mercer, whose wife died some 16 years ago, leaves a family of four daughters and three sons - Mrs. Branton, Kannyapella, Mrs. Stanworth, Koyuga; Misses M. A and J. Mercer, who reside at home; Mr. Alex. Mercer, Mystic Park; Mr. Michael Mercer, Quambatook; and Mr. Nicholas Mercer, who manages the farm at Koyuga.
The late Mr. Mercer was possessed of a large amount of property, both in this district and the Mallee.
The funeral, which was attended by a large number of mourners, took place yesterday to the Echuca cemetery, the burial service being conducted by the Rev. Canon Rowell on behalf of the Rev. H. T. Buntine
Do you have Nichol's probate file
http://prov.vic.gov.au/index_search?searchid=54Cando