They are out there and I run into them occasionally - my daughter is 5'1 and I put together a nice vintage 50cm top tub Pinarello, campy eqiped, 700c wheels - even that is a touch big, but it works. Seems like after I got done with the build I came across 3 or 4 48cm frames including a nice Woodrup, but I wasn't interested in building up another bike. Again surprised you haven't found one. MW