One of the articles says that Jane is the wife of Kennedy RENWICK but they didn't actually marry until 1908. She added the name 'Mabel' which I think she probably invented herself, and she also later used the name 'Annie'. His proper name was William Kennedy RENWICK.
There was a Jane ASTON born in 1869 but that would make her aged 10 years older than stated in the papers. Her age was recorded as 48 when she died in 1922.
1869/38741
ASTON, Jane
Parents: Elisabeth/William
Debra 
I'd also dug up similar information earlier, in an effort to "sort out" a connection to Elizabeth GRAY of 131 Maitland Street, Dunedin. (Hadn't yet posted here as became very distracted by the antics of her daughter Jane - alias Mabel / Annie ... and also locating Elizabeth.).

The aforementioned Elizabeth GRAY is, I believe, one and the same as. "Elisabeth / Elizabeth ASTON".
[Elizabeth JACKSON m. (NZ) William ASTON - 1862. 4 children of that union. The child Jane ASTON 1869 (-birth registered at Stewart Island according to one source ? - another child reg'd at Riverton).
re: William Kennedy RENWICK : Born at Caulfield, Melbourne, VIC -
c. 1875 : Colourful character with a variety of occupations : Appears to have deserted Mabel Jane c. 1916 - and gone to AUS - newspaper notice early 1917 in effort for anxious wife to locate him. He died AUS 1941.
Mabel Jane/Jane, had convictions recorded under forename of "Annie" - bc 1877.
Re: Age difference from that of Jane ASTON - given that she altered her name, and, married a man some years younger, she very likely tinkered with her age also ?
1908 Marriage probably took place in or near, Auckland ? William Kennedy RENWICK is on e/roll Ak-Manukau
1903 claiming seaman's voting right.

There's always a slim possibility that Jane was the birth mother of Roy STEWART - and that he was handed over to her mother Elizabeth STEWART to raise ?
And, perhaps later put in foster care ?
* Might be worthwhile checking if "Roy STEWART" appears on NZ school rolls ?? (A guardians' name would be helpful).
~ Lu