If it's anything like at my school, '15 is the name of the new member class. Every year the incoming new member classes are named by the year that they will graduate (assuming that the new members are all freshmen and will graduate in 4 years). My brother is freshman, so his pledge class is called '15s when they are referred to as a group. I was a junior when I joined my chapter, so I would have been a '12 (even though I graduated in '10).
Would have made more sense if she said "I'm a Kappa new member".
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