You really shouldn't talk about the bid process outside of recruitment week - if you are mistaken in what you tell her it could make her not go through or make bad decisions during recruitment. The Recruitment Counselors are usually trained some in the semester prior to recruitment, but they get a lot more in the week before recruitment. I just wouldn' want to tell someone something and it be incorrect.
The other big no-no (and this is another reason not to talk about the bid process) is bid promising. This is the worst thing any sorority member can do. It makes it hard (if not impossible) for the woman to go through recruitment with an open mind. Even if she knows you can't guarantee her a bid, it's still in the back of her mind that you can somehow pull some strings.
Like I said earlier, NPC is all for friendly conversation. But like bekibug said, it shouldn't have anything to do with your chapter or "rushing" her like you would during formal recruitment. So, talk about recruitment and greek life in general terms, but leave it at that.