Quality Comics first created Miss America as originally Joan Dale, a courageous reporter who had a dream in which the Statue of Liberty appeared to her and, giving her the power to transmute elements (something like a wizard) and instructed her to battle evil. Joan awakes to find that she now has these powers; adopting a patriotically-themed costume, she begins fighting evil as Miss America.
She had a brief run in Military Comics #1-7, then faded into obscurity to a degree that Timely Comics (later Marvel Comics) soon felt free to create an unrelated character with the same name.
Initially Miss America did not have a super-hero costume, largely using her powers surreptitiously. In later stories she wears a costume comprising a sleeveless red blouse, a red and white striped skirt, and a blue cape fastened with a silver star. This costume continually changes in appearance, possibly because she uses her powers to create it. Following her initial run, later appearances of the character add a red domino mask.
In Military Comics #5 she and her male companion are investigating missing American ships off the coast of New England. WWII has not yet started,so the enemy is never really identified but we all know and can guess it is the Nazis, who it turns out have a submarine in the waters there and it is sinking American ships at random. Miss America's investigation leads her to the submarine, she boards it, puts up a good fight but is knocked out with a blow from behind. When she wakes up she uses her powers of wizardry to overpower and conquer the crew of the anti-american sub, thus making American ships once again safe off the New England coast. In the pics below she is shoved into a shaft, later gets KO'd, wakes up, and fights back.