Little update -- I've done a ton of research and finally scheduled to do some test riding on Friday!
I'm going to ride a
Pashley Princess Sovereign and a
Bobbin Bramble.
The Pashley looks like it has nicer components overall, but the Bramble is a bit lighter and might be geared a bit better for hills. I'll just have to see how they feel.
I looked at the Dawes Mixte but it seems that they don't make a frame small enough for me. Bobbin makes some small mixtes but I really want a bike with a chain guard. I don't want to bother with special cycling clothes these days.