I note in the indexes that A Rose Hannah Brown married mark Milne, I really dont know if this is THE Rose Hannah Brown or another person. The fire story makes me think it is a co incidence.. as her mother Rose Anna Brown (nee Atkins) died a similar fate in 1925.
The strange part to me is the fact that there is no marriage to be found for Rose Hannah & Edmund Walter Soutter and the birth of their youngest son Joseph in c 1913 and the fact that there is no birth record for Rose Hannah Brown (under any variations of spelling) in 1883 or around 1883 Tasmania.
The Rose Hannah Brown that married Mark Milne in Victoria was indexed as being brn in Prospect Hill.
I will check some further info in SA as I note at some piont they lived near the grampians which is close to South australia ??