The buy-out amounts on the Dieselgate VW's are REALLY generous, so I can understand why she'd be interested in taking that route instead of having it fixed, whatever that involves.
And it'd be interesting to try a Jetta hybrid...
But I'd steer clear of buying one. It's basically an unknown quantity engineering/reliability wise, exceedingly rare, and you'll have to get it serviced/repaired by a company that only half-heartedly wanted to sell it in the first place.
2014 U.S. VW hybrid sales (all - were there others beside the Jetta?):
1,952
2014 U.S. Toyota hybrid sales (all):
311,205
Source:
2014: A year that will live in infamy? Edition - Autoblog
A nice used 3rd gen Prius makes sense as a high MPG wagon replacement with better cargo-hauling capabilities than a sedan, and most importantly:
known above average reliability.