I think the critical item is getting a dealer to come up with a fit for her. The bike companies will basically build whatever frame the dealer can come up with. Serotta has a test buck for frames, and if you go through a dealer that has the test buck, they can mock up the frame and let your girl friend ride the test buck. At least my dealer had one, and I found it really useful to confirm what I was getting. There may be other test bucks besides the one that Serotta makes. Here is a URL to pics of one: http://www.serotta.com/fit/history.html
That said, don't buy a Serotta touring bike, as that is just not what they do well. My dealer (Continental Bikes) sold Waterford, and that is what I bought. (We just used Serotta's test buck). My dealer does sell Serotta bikes, mostly to people who race or go on club rides. The dealership was originally owned by Mike Walden, a legendary coach in road racing up until is death in the mid 90's.
General guidelines. If you get another Co-Motion, you will have common maintenance for both bikes. You have an existing relationship with a dealer, so maybe you should start there. Your gal's legs are long enough, 32 inches, that is should be easy to get a frame with enough stand over to support 700c wheels. I just don't have an appreciation for her torso and arm length to talk much more about fit. I would be rigid about either giving her the test buck experience or a frame close to that size before I would invest any money with Manny.
My dealer has a sizable client list of Hispanic women, and has placed most of them on Gunnar bikes (Gunnar is a subsidiary of Waterford). I would get a Waterford over a Gunnar because Gunnar does not have a touring specific bike frame. I have no idea why there would be a lot of Hispanic women looking for nice bicycles in Detroit, or why all of them go to Continental Bikes. Life is full of mysteries.
If fit turns out to be a total nightmare...The historical answer has been to look at a Terry. Georgina Terry stretches the frame out and uses a really long rear wheel stay for a 700C rear and a small (24"?) front. I don't know if Terry has a touring bike, but maybe there is something woman specific that would work for her.
Good Luck and post details about the shopping experience.