Condolences Bill, Looks like the group mentioned everything I would tend to say. I would just reinforce using local resources like local quilting and sewing groups and to not deal with shipping of any machine.

What are your goals/intents?

To sell (make as much money) as possible from your wife's sewing stuff?

To find homes (donate) the stuff to friends or organizations you deem worthy?

To just "get it gone" ?

Sort through and keep what you (or other members of your family) might want/need/use?

If there is no rush - you might even learn to do some sewing/quilting yourself.