What searching have you done so far? 
From a trove search on William Sands 
 SANDS.-On the 30th of April, at Launceston, the beloved wife of William A. Sands, of Beaconsfield, in the 26th year of her age. Her end was peace. 
Launceston Examiner (Tas. : 1842 - 1899) Friday 14 May 1880.
That does not match as birth would be ~1854.. the date of their marriage? Umm .. errors? 
Search on Anne Sands 
"Ann Sanders said that on Thursday evening, the 4th instant, she met deceased in Sing David-lane. Slmcl welL Deceased was alone, with her hair hanging loosely over her neck, and much excited. She had )ģeen drinking, and iu reply to witness said, ' My husband is going to beat me.' Witness advised her to keep out of his way, and she promised to do so until his temper was over. The deceased was not a female given to drink, and "
The Cornwall Chronicle (Launceston, Tas. : 1835 - 1880) Saturday 29 August 1863
? What do you have for her ? birth, death date & place would help? 
 Will of her husband give any clues? 
There are a few results for Mary Ann Sands ...