Finding a road bike for 5'2'' girlfriend
I'm answering the unasked question: "How do I find a hard-to-find bike?" 

Certainly this bike exists, but you may have to stick with your search for some time before finding it. (I sympathize with the situation. I take a 19" frame in mens, and most bikes are too large for me.) 

Mens' bikes often have a reach that's a bit too long, and handlebars that's a bit too wide for ladies. (Not always, depends on your girlfriend's dimensions.) 

Some general thoughts: 


Work with your bike shop. They may have something in stock, but more importantly, a good shop will keep an ear to the ground for you. 
Try a bike co-op. You may find a used frame inexpensively, or even maybe a complete bike. 
Keep searching on Craigslist and Ebay. Learn what frames and bikes you're looking for; on Craigslist in particular, sellers often think that bikes only come in the sizes "kids", "boys" and "girls", and don't list the frame sizes. If you find out what bikes came in the sizes you want, you can at least target your searches better. 
Do you have a bike club? Spend time on bikeforums? Subscribe to any mailing lists for bikes? Spread the word! 
Did I mention to work with your bike shop? 


Stick with it. Keep searching. 

If you're not willing to wait, you'll have to either adjust your budget or your expectations. But don't lose hope; the right bike is out there somewhere.