WA BMD index is free online.No sign of marriage but there is a death of Mary Goodman in 1921,parents not shown.
Mary is on electoral rolls in 1917 in Perth CBD,house duties,no other Goodmans listed with her.
Trove (digitised newspapers) has death notice to match submitted by Florrie Green and her three sons stating Mary is her only sister.Death occurred at Woorooloo Sanitorium.
http://www.outbackfamilyhistoryblog.com/2014/07/14/wooroloo-...Can't see marriage for Florrie in WA.