As a result of advice from hee yesterday my daughter in laws NZ passport now been extended to dte of her passport expiry (Nov 2020). She was fined for overstay though, and needed her pic of the tabin. Now she can apply for NZ passport renewal as the passport will not have enough validity to travel by mid May.
TLDR : Answer Summary
The user's daughter-in-law successfully extended her NZ passport to match its expiry date in November 2020. Although she faced an overstay fine and needed a specific document (the tabin), she can now apply for passport renewal as her passport will not have enough validity for travel by mid-May.