'trademe' on line, is where people buy and sell here in NZ, if she just looks in the Auckland area she can ask to view prior to buying, this will also save on transport costs, take along a friend who knows something about sewing machines and ask to try it. You can also view the sellers record on line. I have bought and sold this way a lot and it is great. Get to know how the system works first so as she is familiar with the way it all works and she should have no problems. Best of luck for her year in NZ it is a wonderful place!
Gal