My 'kid sister' (now 50
) stands about 5'1" and in 1980 bought a 19" Fuji Gran Tourer SE . That 19" works out to around 48cm. That was in the era of 27" wheels, too. Of course you might try a classic Mixte frame as well... Lots of barely ridden gems from the '70s and '80s can be found out there. 27" tires are getting rare, but can be found. Heck,
I'm still riding my road bikes with 27s!
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'75 Fuji S-10S bought new, 52k+ miles and still going!
'84 Univega Gran Tourismo
'84 Univega Viva Sport
'86 Miyata 710
'90 Schwinn Woodlands
Unknown brand MTB of questionable lineage aka 'Mutt Trail Bike'
Plus or minus a few others from time-to-time