non greeks posing as greeks

[HeavenslilAngel]

I know there was a thread on this but don't remember where it is. I went out of town this weekend and a girl that I know had on an XYZ letter shirt. I went and talked to her about this because I hadn't seen her wear XYZ letters before. I asked her when she had joined and I don't remember what she said and she said somthing about she hadn't been able to get a lot of lettered stuff yet then she asked me about my sorority and what kind of sorority we were and I mentioned we were an NPC sorority and she asked me what NPC was so I told her and she was like "oh yeah!". Now I don't know about every sorority but in ASA we are taught what the NPC is pretty early on. My question is should I contact the respective chapter and see if she is a sister or if shes not let them know they've got someone posing as a sister or should I do nothing. I would think they would try to collect the letters from her if shes not a sister.