Interesting...in looking at the geometry charts Cannondale actually DOES have pretty noticeable differences between their men's and women's frames. There are 6 available sizes for men and only 4 for women. And the sizes don't correlate as expected.

You ended up with a men's medium...what size was the women's you tested? You're about my height--a medium sounds maybe a hair big for you. My current Cannondale mountain bike is an XS/Petite. That's a bit too small for me (I'm 5'3.5" and like to be in a fairly stretched-out position). A small should be perfect. A Tall would be too big.

In the Quick I think I'd likely need a S in the women's or the men's. Those sizes appear to be the same across both genders.