In 1948 Timely (ot Atlas) published three issues of SUN GIRL, a tough girl with a "sunbeam ray" probably modeled on Phantom Lady's black light beam. In these three issues, only once does she suggest super-strength, when she bursts through a heavy wooden door.
Editor Stan Lee also worked in a few appearances of other Marvel heroines, probably to dispose of inventory material. Here's a so-so Miss America page.
Blonde Phantom got two separate backups, the first depicting her rather atypically using one thug as a flail to hit the other, while the other includes a one-shot villain who's probably the first to use the name "The Spoiler."