Take her to civil court and try to get a settlement for slander and lost income, then have all her wages garnished until full restitution or the rest of her life, whichever comes first.
He would probably spend more on a lawyer than he would ever recover from this woman.
I would really have to look at her earning potential before I would bother with a civil suit.
Recovering your lawyer fees and lost wages would be a good thing though. If she had an ability to pay.
Otherwise you are just throwing good money after bad.