Catherine Byrne transported to Australia 1839

I have been searching for the town of origin for my Ancestor Catherine Byrne for some years.  On tracing back through my family history Catherine Byrne (born 1820) was tried at the Old Bailey for stealing bedclothes in (I think June) 1839.  She was transported to Port Jackson, New South Wales via the Minerva II arriving in Australia in December 1839.  (she stayed in a prison for some months before being transported).  I have checked the Records of the Old Bailey and have scoured the Convict indents hoping to find a town of origin but have only found Co.Kildare to date.

Her parents are cited as being John Kennedy and Mary McDonnell according to her death record in NSW.  However she changed her name to Sarah Kennedy around 1850 ish possibly to hide her convict origins.  Therefore I have made the assumption that her father was reallly John Byrne, and she had to name him Kennedy to hide her own change of name.   One doubts she would forsake her mother, but one never knows, both parents could be entirely fictitious.  Keeping that in mind I have searched the tithe applotments however with a name like John Byrne, I have found too many.  I wonder if there are records in Kildare of people who were transported?  Other suggestions would be very welcome.

Thank you

Janine Hinton

Western Australia