I believe shops and such tend to detune the tips and tails because it might lead to less experienced skiers catching a lot of edges. I don't know about this, though I do believe that my tips and tails are detuned. In any case, I think most people here believe that keeping the entire edge sharp is the best way to go, but if she's a fairly low level skier (you said this is basically her second trip) you might want to detune them just a little so she isn't constantly falling. Hey, how about this: leave them sharp for now, and take your tuning stuff with you. If your wife has difficulty with them, you ought to be able to detune them right on the slopes. The only problem is, how do you tell it's the skis and not something else. Of course, the only thing that leads to catching the edge on sharp tips is imprecise technique, but there's no crime in making a ski more forgiving for a less experienced skier. Anyway, let's see what the experts have to say, I guess.