Hi Pablo and welcome.
Firstly, congratulations on falling in love.

A great time and long may it last.
WHV - I would have thought sense would have dictated it would start from when she enters NZ but it says in
here ....
A work visa issued under a Working Holiday Scheme is valid for 12 months. This means that you will have 12 months from the date your application is approved to arrive in New Zealand. You will also receive a multiple entry work visa which allows you to leave and return to New Zealand during your working holiday.
The main purpose of a WHV is to holiday rather than to spend the whole time working. Its use is to allow visitors who wish to see quite a bit of NZ to do some work to help fund their visit. So far I haven't found any guidelines that state exactly for how long they can work.
The other alternative you could try is
this where your partner can get a work permit to allow sufficient time living together to qualify to apply for PR. That may be your best bet. You don't need to have lived together for 12 months for this, just having had a lasting, genuine relationship.
