WSD or not. What's a short girl to do???

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73cm or so.

It would be close, but I think maybe doable. Sounds like you also have a long torso. I'm not convinced that a WSD is going to be better for you. Standover for both the men's and women's Synapse 6 is the same (72.1). If they were too big you'd have to go down to a 44, which only comes in WSD. But then I wonder if you'd be cramped in terms of reach.

And those both come with SRAM Apex, which means you wouldn't even need "women's" short-reach components.