Mrs. Woolcock’s Confession. (1874, January 6). Yorke's Peninsula Advertiser and Miners' News (SA : 1872 - 1874), p. 3. Retrieved November 30, 2019, from http://nla.gov.au/nla.news-article215904721
Unless you have reason to believe the confession is fabricated, then a visit through the newspapers on Trove must give all the opinions that were available at the time.
I would think publications from the time, and court transcripts and witness testimonies should be more reliable than family lore over several generations. Time skews memories.
My first cousin, with many removals, was Priscilla Biggadyke - the Stickney Murderess. The real perpetrator confessed on his deathbed, but too late for her.
Good luck with your research.