What is your budget?
Are you looking for "vintage" or "cheap" or something else? Personally I'd start with a little more modern 9 speed (or so) "brifters" bike. Maybe 8 speed.
There are quite a few "road" bikes that show in the Norfolk area. Some of the ads are a bit old, so who knows if they are still available.
Sometimes I have troubles judging frame sizes based on OS tubing sizes... so much easier with the smaller tubing in the "vintage" bikes.
Small Women's Trek, $400
Small Felt for $250
Ironhorse for $350
Ancient (relatively speaking) Giant, Lugged Carbon Fiber - Offer
2010 Schwinn Le Tour $250, looks like the head tube may be tall, but perhaps a sloping top tube and shorter seat tube, photos aren't too good
Small Trek 1000 for $400
Small ZR 4000 for $275