Looking for Mary Heenan OR Heneghan Born 1848 9 Australia

I am looking for Mary Heenan, the daughter of John Heenan (or Heneghan) and Margaret Kelly, she was possibly born in Australia 1848/9. She was the eldest daughter - I have been able to trace all the rest of her brothers and sister - but can find no trace of Mary.
I am also trying to find when the came to NZ - they settled on the West Coast of NZ. If there are any other Heenan family researchers out there I would love to hear from you. One of their children (Martin) was registered under the name Heneghan so Mary could be registered under either name.