Does it have to be WSD? Sorry, don’t remember your original post!
Has she been able to demo any bikes at all?
Edit: just tracked down your original post. Have you actually asked any shops if they can get a demo bike for your wife to try? Are there any manufacturers demo days around, you know similar to what they do for mtbs at trail centres?
Do you have an lbs who may know other roadie ladies who may offer a try-out of their bike?
I think you’ll have to accept that some time will be needed on the phone to track one down in the size you think that’s needed.
My only other suggestion – I did have an extra small Scott men’s road bike but have now moved to a small Scott men’s. The extra small would be worth considering.
Hope this helps!