Pedro,
Preiser makes a US Army Air Corp set with a couple of ladies. Would need to modify their clothing.
Another option might be in O gage railroad figures. They actually scale out at 1/43rd so would be a little big if you have other 48th scale figs in the dio but you can find a pretty good selection.
There are a couple of places on the internet advertising 48th scale stuff. How about the lady at the top of this page http://www.northstarfigures.com/shop/projektx/index.html Check out this site http://www.northstarfigures.com/shop/index.html or http://www.ngtrains.com/figpic.htm or
http://www.phpshopxml.com/quakit.shop/CID/bb8956000611b7ea0efaeb2c9ecc04e2/function/subFamilyPageDisplay/shopFamilyCode/FIGURINES