One other thing - her changing her story again makes it harder for Nifong to get this case to trial, not easier. It's already generated yet another motion from the defense that he has to contend with. Getting the case to trial benefits him. Not getting it to trial benefits her.
The defense will deal with the civil suits later.
IMHO, I doubt the defense wants NiFong to extract himself. They want him "on the stand" and "under oath". They know he's lied through his teeth and they have proof.
Remember that Nifong said he hadn't talked to Crystal because he didn't want to wind up as a witness.