Bulletgirl was a staple Golden Age damsel in distress. Sidekick to Bulletman, she was head KO'd most often, but she does have a couple gas KO's and even one (really bad) chloroforming. Interestingly enough, her bullet helmet does practically nothing in protecting her from head blows.
Taken from Wikipedia:
Bulletman was a Fawcett Comics superhero created by Bill Parker and Jon Smalle for Nickel Comics #1 in May, 1940.
Chemically-induced super-strength and intelligence, Gravity Regulator Helmet allows each to fly and deflect bullets.