Chill out man, you are still in year 13 like me. We don't need to get worried over it. Sure an interview is a chance to sell yourself as an individual and make a good impression but your GPA and UMAT will also be important factors to consider.
Actually, I do appreciate why she's worried about it. If I recall correctly, a brief browse of the NZ forum would reveal that the interview is one of the main reasons she chose Auckland over Otago.
Juna: Again I stand by my interpretation, and since there's ambiguity and uncertainty, I'd recommend that you go ahead and email the HoD to get a clarification. At the same time, I should mention that facts, as they are passed from one person to another, can be misheard, misread, misinterpreted, etc, so I do recommend getting the official word from the HoD, and sticking with it, without getting too bothered by random people (who are less informed than the HoD) saying stuff, such as liaison officers saying "yeah I heard it might change next year"...
Also, a word of caution: if OLY1 is anything like HSFY, there will be rumours which are downright lies spread for the sole purpose of intimidating the competition, so I do recommend getting into the habit of seeking official clarification, or, if officials aren't the place to go, at least get an unbiased clarification, then stick with it and seek hard evidence if anyone tries to tell you otherwise.
If the population health paper at Auckland is anything like the epidemiology paper at Otago, then when you do that paper you'll appreciate the amount of pseudo-facts floating around, and that we can't trust the "authoritative man in a white coat telling us stuff", much less some random OLY1 guy telling you something ludicrous like "you're screwed without a 90th percentile UMAT".