Question regarding perjury see details.?:
He's a convict, she doesn't have much to worry about legally.  There's no chance (almost...) of her being brought to trial on a perjury case, but he might be able to do something in civil court... honestly if she has a new car she should give the car in question back just because it won't be worth the hassle.  Remember it's up to the distric attourney whether or not to bring criminal charges, and he's not likely to get involved in a family dispute like this...

Even in the very obscure possibility that the DA did even consider the case, he won't prosecute for one very good reason.  The case would be based on one thing, the word of a convict against the word of your neice, her mother, and her grandmother.  DA's don't prosecute cases they know they can't win.