I have some information as follows passed on to me, but the dates don't line up:
"She came to NZ in 1857 aged 46 after her husband William died. She brought her 2 daughters aged 13 and 6, and two sons aged 12 and 1 year old. It is not certain if two older sons aged 20 and 16 came to New Zealand. William, Abraham (Australia), Martha, Helena."
I have seen a daughter Eleanor on Ancestry.com not Helena.
All very confusing!
Also I found information that she remarried in NZ to George Baynes Birch, 7 July 1867.