I'm looking to sell my Blue AC1 (aero road) bike, size XS, as it is just too small for me (I'm a tad over 5'5"), and so it's seen very little use. It's 11-speed Di2 (dura ace + ultegra), but I'd also consider just selling the frame. FWIW, the frame is slightly smaller than my CAAD9 50cm bike, which fits me perfectly, so I'd guess that your wife would fit best on something more in the 48-49cm range, but that's just IMHO. PM me if interested, thanks!