Looking for Margaret Heenan from Ireland Via UK to Australia and New Zealand

I am looking for further information on Margaret Heenan born 1830 in Ireland and who died 1898 in Hokitika New Zealand. She was the wife of John Heenan - they presumably married in Ireland - I would love to know her maiden name, her parents and where they came from. (I have details of their children) John may have come from Offaly. They left Liverpool for Australia on the Morning Star and lived in Australia for a while.