You've got a number of options. Since you're asking about 1/48 and 1/32 scale, I assume you want them to go in an aircraft diorama?
There's a Japanese company on Ebay called Aurora Models that makes some white metal 1/32 Luftwaffe, Flak and Red Cross auxiliaries.
Legend makes some modern US Navy female pilots.
In 1/35 scale, you've got plenty more options. Masterbox alone makes US Navy and Luftwaffe women.
Not sure about 1/48 though.