Hi Sue,
I am also researching Elizabeth Radford, who is my 4th great grandmother.
I keep hitting dead ends with finding anything about Elizabeth before her marrying William Pote.
I'm not sure if you've seen the following newspaper article, so I just thought I'd mention it...
There is mention of Elizabeth in the Taranaki Herald in 1891 as a new settler arriving on the barque Blenheim. In this article, they mention Elizabeth as Mrs Pote instead of Elizabeth Payne, which gives another reason to believe that Elizabeth Payne on board the Blenheim is Elizabeth Radford.
In case you haven't seen this article, here is the link:
https://paperspast.natlib.govt.nz/newspapers/TH18910702.2.28#print