Before coming across this site I had also come to the conclusion the Catherine was (a) unregistered (unless some really bad spelling) and (b) born before her parents were married. i am also wondering if even though Mary Annie Keeley and William John Wilmshurst were married, if Catherine was even his child, having been born before their marriage.
In the court when William was being sorted for desertion and maintenance 1865, Mary Annie was referred to as Annie.
Interestingly Annie Keeley was also in court in October 1862 with Patrick Creamer who was up for child support for his illegitimate daughter by Annie.
POLICE COURTS. ADELAIDE: TUESDAY, OCTOBER 21. [Before Mr. S. Beddome, P.M.]
South Australian Register (Adelaide, SA : 1839 - 1900) Wednesday 22 October 1862 p 2 Article
Was this daughter Catherine?
(pause for dramatic music)
I am continuing to check for a child with variations of Keeley, Creamer and Wilmshurst surname, even though it is possible she was not registered at all.
I have come across Patrick Creamer before in doing my mother's history, luckily he's not related, as yet (he has a bit of a rep being in court for other minor offences) but there was also a Catherine Creamer around the same time who was of his generation which may indicate Catherine as a family name.
Mary Annie's background as I know .... father John Keeley
Mary Annie Keeley was born 1837/1838. She arrived in Adelaide from Liverpool on the ship Bee on 9 October 1858