Just checked my bike and I’ve got the 49 tricross (there is a 46, but I do t think they import that size I to the uk). Strangely the Tricross has a relatively short top tube for a 49 frame as the ETT is 516. This is a more ‘female’ geometry than other ‘unisex’ bikes and compares well to my women’s specific road bike (48 frame and 506 ETT). Just checked the bars and cranks as well – Tricross has 400 width bars and 700 cranks, my women’s road bike has 380 bars and 650 cranks.
Overall my road bike is a perfect fit for me, the Tricross is slightly bigger but actually very comfortable to ride and might be spot on if Mrs M is 5’1″ as I am a mere 5′!
Sorry for burbling on with lots of measurements, but thought it might be of help if you’re looking at other bikes too. Offer to meet is no problem, I know how hard it can be as a ‘smaller than average person’ to ever test rides bikes!