Seems to me that this is a good birth match for Mary DEVLIN, given that her father had a business there and that her birthplace is given as Hill End which is ony 4.5k away.
NSW 1856 #7982 registered at TAMBAROORA
Mary A DEVLIN Parents: John, Margaret
Possibly Isabella:
NSW 178/
1848 V1848178 59
Isobella (sic) DEVLIN Parents: John, Margaret.
FamilySearch has this:
Isabella DEVLINChristening Place St. James, Cumberland, New South Wales, Australia
Birth Date and Place: 11 Mar 1848, New South Wales, Australia
Parents: John Devlin, Margaret
Not sure about the date unless it's been copied incorrectly or perhaps Isabella may have been born at sea or before they left and was registered and baptised in NSW.

I didn't look at the whole shipping list to see if there were any births on board.
Judith
Just adding the In Memoriam reference in case anyone else is looking
http://trove.nla.gov.au/newspaper/article/14061226