Trying to justify the NZ govt is evil is fairly hard when its providing universal hospital care and National superannuation payments to pretty much every one over 65..
I can't speak for her but I would imagine she might say that is part of the plot to lull people into a false sense of security. Anything can be turned around to prove the opposite once you go down that particular rabbit hole. I know. I have had these discussions with her.
As much as you care for this person, you need to understand, you aren't going to get through to them. They need a bigger shock than you can provide, and they will have heard your argument before.
I have the same thing with my nephew, his girlfriend and their brand new daughter. It breaks my heart, but all that happens is a wedge ends up between us all. We have told them we love them and want them to be safe, and believe in the science and evidence behind the vaccine, and left it at that.
I suspect the inconvenience of the passport requirement to enter most premises now will be what gets them across the line, though it's amazing to me you can enter retail without showing it. That would surely move the needle.