For others coming across this thread in the future …
Mary, daughter of James and Caroline MAKEN (spelling as per two indexes noted below) was born 30 August 1849 and baptised at Carcoar (NSW) 5 October 1849.
https://familysearch.org/ark:/61903/1:1:XTC2-55X : 11 February 2018 family search index
NSW BDM online index has Mary, dau of James and Caroline MAKEN, baptism 1849, Volume 34A line 1609
If this is Mary MAKIN, third daughter of Mrs BOLSTON, then Mary was not yet 21 when she married Christopher DONNELLY, and so the name of the person giving consent to marry should be recorded on the parish register, as well has the names of Mary’s father and mother (maiden and then current and possibly any other names she may have used in the past)
There is an Ann MAKEN marrying a James COX in 1851, Vol 37B, line 65, registered in the parish registers for St James C of E, Sydney.
Re the thought that Mary’s mum had three children by James, and that Mary was the third … ie that Caroline was a misread for Catherine. There’s two baptisms that may be of interest, but I note they are NOT C of E (so they are different denomination from James and Caroline’s daughter Mary).
NSW BDM online index gives:
Elizabeth A, in 1847, daughter of James and Catherine MAKIN, line 857 of Vol 49
Catherine, in 1846, daughter of James and Catherine MAKIN, line 866 of Vol 48.
NSW State Archives gives Volumes 37 and 48 and 49:
https://www.records.nsw.gov.au/archives/collections-and-research/guides-and-indexes/births-deaths-and-marriages-registers-1787-1856 There’s an excellent section under the heading ‘Historical overview’.
And familysearch gives
Catherine MAKIN baptised 10 March 1846, in the county of COOK, with parents as James MAKIN and Catherine MCARTHUR.
https://familysearch.org/ark:/61903/1:1:XTD8-DLG : 19 April 2018
See also
https://www.records.nsw.gov.au/archives/collections-and-research/guides-and-indexes/births-deaths-and-marriages-guide I continue to suggest seeking out the primary source documentation.
Cook County should be mentioned the the atlas found via this thread:
http://www.rootschat.com/forum/index.php?topic=700823.0and also here
https://catalogue.nla.gov.au/Record/3791348 JM