To my eye, that Jamis Commuter looks the most like a "real" bike. The other two bikes have really high handlebars. Yeah, that is really comfortable, and it does help enhance one's view of traffic and general terrain. But the problem is that you need a somewhat acute angle between leg and torso to enhance leg power. That Jamis Commuter looks like a reasonable compromise - the handlebar is a bit higher than the saddle, but not way up high either. I think the Commuter looks like the best bike for your wife to explore if she really wants to get into biking. If the answer is "No" - well, the other bikes look very nice for a level few miles of biking just to get from point A to point B in a relaxed comfortable way. They'll just be a bit frustrating if she wants to get a bit more power to the pedals.
Jamis and Giant are good brands and really any of those bikes can work, though, so just get out riding and have some fun!