You want to ask the basics, but clearly you also want to engage in a meaningful conversation.
as adpiucf said, ask her why she's there! Sometimes potential new members are looking for a good group of friends. Sometimes they're looking to get involved on campus. Some of them are completely out of their element, and enjoy the fact that they're trying something new and random, and they're looking to see where it takes them. And when you ask questions like "why did you decide to go through recruitment?" occasionally you can immediately pick out the girls that you DON'T want. I see just on this site alone stories about girls who, when asked, say something like "I want to know which fraternity has the hottest guys." It's sad, but it happens.
Another good thing to do is ask them if they have any questions for you about the sorority. It will let you know just how interested they are. If they ask a question, answer it, but don't spend your entire time with them talking about the sorority. Make your answers short and sweet. If they ask about philanthropy, say something like "we participate in Habitat for Humanity, and each year, as a group, we help to build homes in the surrounding community." Then ask her, "Have you participated in something like that before?"
These question and answer sessions will allow you to gain more insight into who the PNM is as a person, rather than just where they're from and what their major is.
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I believe in the values of friendship and fidelity to purpose
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