Ann GABB born 1840, Richlands (I think this would be a locality near Crookwell NSW), married 1858 NSW,  and was a mother by 1860, sadly two infants succumbed before Hester  JORDAN was born 8 August 1864.   
May I ask about that marriage registration ...
What denomination,  which clergyman,  and what is the relationship recorded on that record for the person noted as giving permission for a minor to marry.  Also what names of the witnesses - perhaps a deep background search for them may help.   It may well be that there are some blanks on the m.c.  - not at all unusual for the era,  but assuming the celebrant was a clergyman, then his parish register should have all the elusive details about the bride, the groom, their respective parents... Always useful info to use to confirm/validate the known knowns.  

JM