It seems that Winifred and Joshua Holt may have separated prior to his death. By 1863 she was living with Henry Mack. They had four children before he married Agnes Struthers in 1898. Holt was given as Winifred's surname in her death certificate.
'Holt, Winifred (1831–1927)', People Australia, National Centre of Biography, Australian National University, https://peopleaustralia.anu.edu.au/biography/holt-winifred-26744/text34368, accessed 1 April 2023.
1831
Loughrea, Galway, Ireland
4 July,
1927
(aged ~ 96)
Young, New South Wales, Australia