In all the years I worked in bike stores, I can remember running into just one example of a woman asking for more reach. She was a national-class runner who wanted to transition to bike racing, figuring she'd have a better shot at making the national team for the Olympics.

So she got a racing bike, but then she had me adjust her saddle farther and farther back, to the point where it looked almost ludicrous. If she or I had thought of it, she'd probably have had me install a longer stem.

I now realize that the problem was probably that she simply needed a wider saddle. (Pushing the saddle back rotated her pelvis to a narrower section.)

There's at least a chance that that's what's going on with your wife, too, if she doesn't already have one of the wider saddles on the market. Might be worth a visit to a local shop that has a sit bone measuring tool.

Also, just found that Specialized has a do-it-yourself sit bone measurement page.