Quill stems can give you a lot more height latitude than threadless stems and some very long quills are available. The stem riser davidad linked to will extend a threadless steerer but I'd be VERY leary of using it on a carbon steerer.

Here are links to adjustable threadless stems that will allow a 45° up-angle. These things are heavy and require either 25.4 mm or 25.8 mm (same as 26.0) bars, not the more current 31.8 mm.

http://www.nashbar.com/bikes/Product...5_10000_202442
http://www.nashbar.com/bikes/Product...1_10000_202439

I agree that if the bike you show is adjusted anywhere near your wife's required saddle height, getting the bars to saddle height will be nearly impossible. You either need a different frame size or a different bike.

http://www.nashbar.com/bikes/Product...5_10000_202442