There has been a fictionalized novel written about her by Carol Preston. Of course it relies on many guesses.
New South Wales Death Certificate:
This age of 48 (47 on the memorial) would make Susan seem to have been born about 1826 and married about 13 years old! On the other hand, when her daughter Mary was born, a birth year of about 1820 was implied on the certificate, meaning she would have been 19 years old at the wedding. In any case she was young, and her parents were not there for the marriage.
A ship called the James Pattison arrived 11/02/1836, sailing from Cork loaded with single young ladies as part of the program of the London Emigration Committee Ships 1833-1836 Scheme. In the words of Dr Liz Rushen, who has researched and published about this program (see her website),
This would imply she was born about 1817, making her a bit older at her wedding than some other records.
Person papers sourced via Ancestry.com have added further details https://www.ancestry.com/mediaui-viewer/collection/1030/tree/169481096/person/142426234774/media/ddd4af05-d5fc-4555-a083-275cc33ecca1?_phsrc=ELr21&usePUBJs=true&galleryindex=7&albums=pg&showGalleryAlbums=true&tab=0&pid=142426234774&sort=-created
Marriage with George Oaks
It took place in the district of Yass, 12 Jun 1839. The couple are named as George Oakes and Susannah Casey, both of the district of Yass, and both single. It was a marriage by banns, with consent of friends; in presence of Wm Cook, Gownion (difficult to read), and Th. Jones, Manairoo. It took place at “Davis Inn” in Gownion. For some reason the marriage is not indexed. Luckily genealogist Judy Taylor found it in her study of the Oakes families of the region.
See also:
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C > Casey | O > Oakes > Susan (Casey) Oakes
Categories: Yass, New South Wales | Limerick, Needs Birth Record | Bounty Immigrants to Australia | Migrants from County Limerick to New South Wales | Burrowa, New South Wales | Murringo Cemetery, Murringo, New South Wales | Assisted Irish Immigrants to Australia | James Pattison, Arrived 7 Feb 1836 | Australia, Needs Profiles Created