It looks like Mary's sister Florence was divorce
POLICE COURTS. (1925, December 5). The West Australian (Perth, WA : 1879 - 1954), p. 6.
http://nla.gov.au/nla.news-article31895650this looks like Florence's marriage in England
Marriages Dec 1912
Goodman Florence E Green Hampstead 1a 1522
Green William J Goodman Hampstead 1a 1522
Cheers