If this is a structured formal NPC recruitment, then yes, there should not be any contact between the sisters and the PNMs outside of the rush room. If this is informal recruitment, then those rules don't apply, though it's generally in bad taste.
I can see how this may confuse PNMs - if I were in their shoes, I would think it meant they liked me and I might get a bid and therein lies the danger. Not smart on the sister's part IMO.
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zeta tau alpha "My crown is in my heart, not on my head."
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