If Grand Jury members ask her questions all the better for fooling her into thinking she can stand up to a real cross. The grand jury is very unlikely to have anyone on it with independent information about the case.
Especially since Mike Nifong purposely tainted the jury pool with his premature leak that there was a "DNA match" when, in fact, there was no such thing.
Surely there are some of the jurors who are internet users and do have more info than what Nigong spoon feeds them. Of course, she has been credited with having an Oscar Award acting ability, so who knows.