I know someone who converted to Judaism, yet throughout the whole process was telling me personally (so I can't tell the Rabbi) that she wasn't interested in keeping Torah AT ALL but was telling the Rabbis that she was. After the Geirus (conversion) she went back to behaving like a gentile.
Is she Jewish? Are her kids?
I can't ask the Rabbi in this case, as he will know who I am talking about. Whom can I go to for advice on what to do?