So, I am about to leave for Europe and take my laptop with - but my wife's F:NV savegame is on there. I need to transfer it to the desktop, where I also have F:NV. Is this something I can do through Steam or what?

Well you could go into ....\my documents\my games\falloutnv\saves\ then attach her save file/s to an email and send them somewhere retrievable.

That worked, thanks!