The Raleigh is a mixte frame which is very rare nowadays but was common in the 80's. It's a similar frame to the 25 year old Raleigh my wife bought the other week. The low end Ezee model using older parts, the Liv, has a similar shaped frame too.
Also it's made of thin but strong steel tubes, and has slender forks with a nice curl at the end.
All very 20th century!
Your Wisper (and mine as well) is made of fat aluminium tubes. The crossbar is curved and sloping, for design rather than functional reasons. Also it has suspension forks. All of these things mean it would have to be 21st century, or late 90's at the earliest. Flat bars are also modern but could be a bit earlier - perhaps as far back as late 80's.
Other things that give it away but can't be seen on the picutre would include the type of headset and stem. Wisper adjustable stem is modern (although I think it is threaded, which is now old fashioned), whereas your wife will presumably have a traditional, non-adjustable threaded one. I can't quite see if she has downtube shifters.