From notice in paper Charles Oscar and May/Mary Louisa appear to have separated on/before 1908, so did she remary?
Speculating here:
WA marriage 1909 May L. JACKSON and Frederick J. J. FOLEY; Perth; #253
Frederick John James FOLEY died 1951
https://www2.mcb.wa.gov.au/NameSearch/details.php?id=KC00006019https://trove.nla.gov.au/newspaper/article/48985930?searchTerm=FOLEYFOLEY: On Aug. 16, 1951, at Victoria Park, Fred, the dearly loved husband of May Louisa and loving father of Thelma (Mrs. E. Lowth), father-in-law of Eric and loving granddad of J and R; aged 66
FOLEY: On Aug. 16, 1951. Fred, dearly loved father of Thelma, father-in-law of Eric and loving granddad of J and R.
WA birth 1912 Thelma E. FOLEY; Perth; #15
Marriage: 1936 Thelma E. FOLEY and William E. LOWTH; #1040