The PM2014 is a relatively new model. The oldest reviews that turn up in a search are <4yo.
PM continued their practice of naming their lathes backwards from everyone else: max spindle length between centers first then max diameter over bed.
It is a 110V lathe with an inverter to convert to 3-phase and variable speed.
If it includes the 13" bed extension, a swing-away for the tail stock, or a PM caster set; they would each add value.
The cheaper price you said is likely for the lathe as "benchtop" (no base) and the higher price with base.
https://www.rockler.com/powermatic-pm201...AUQAvD_BwE
I think that I got a 20% discount by buying a demo lathe at the end of one of the AAW annual symposiums.
Depending on how quickly the widow wants it gone, 70-80% of new would seem reasonable. (60% if she really wants it gone quick). The $2500 suggested above would be 80% and a good place to start if it does not have the bed extension. I think that the most recent Jet/PM sale just ended. So, that will help with the re-sale value.
The widow also needs someone to tell her about the value of whatever tools her husband bought. High end tools from Doug Thompson or Woodturning Wonders can quickly add up to the cost of the lathe.
The price of Nova chucks vary hugely. A SuperNova2 chuck resale is ~$100 if it is in very good condition. It is not likely to be a Titan (higher price) for that small of a lathe. The other 2 common Nova chuck models are cheaper than the SN2. If it is one of the Nova chucks with quick-change jaws, it may be more of a collectors item (bigger bucks) than a user in today's market. As new as the lathe is, my guess would be that there would not be a large assortment of chuck jaws. IIRC, you turn. If so, you already know that jaws can be pricey.
If you could help the widow out with a visit to help with inventory and pics, we can try to get you better answers.