Hi Nicky
Some additional info for you >
Arrival in New Zealand :
Ellen ANDREWS arrived in New Zealand aboard the troopship > "Briton" > which had left UK on
25 December 1918 and was transporting a large number of returning soldiers (and some wives and children).
I found her name on the "Briton" passenger list (@ ancestry.com) -- indexed as "Mrs
E. G. ANDREWS" -- figured that the "G" was possibly in error of "S" - her husband's second initial. But on looking at actual image, seems it might read as "Mrs E. I. ANDREWS".

Aged 24 years / "travelling with husband" / future permanent residence - NZ / contracted to land at Wellington :
Alas, the actual names of the soldiers did not appear on this passenger list (- I think it may have been for "security reasons" ??). And wasn't able to find a New Zealand Immigration list for this voyage either.
Eventually located a newspaper article which had a very long list of the returning troops,
[Draft 211], amongst which was >
2nd-Lieut. E. S. ANDREWS, Wellington :
The "Briton" arrived at the Port of Lyttelton (South Island) c. 29 January 1919.
https://paperspast.natlib.govt.nz/newspapers/TS19190123.2.79 ~ Lu