There is a very interesting documentary called "Professor Marston and the Wonder Women" and how they created her in 1940 as a feminist super hero.

William Moulton Marston, a psychologist already famous for inventing the polygraph, struck upon an idea for a new kind of superhero, one who would triumph not with fists or firepower, but with love. "Fine," said Elizabeth. "But make her a woman."

Not even girls want to be girls so long as our feminine archetype lacks force, strength, and power. Not wanting to be girls, they don't want to be tender, submissive, peace-loving as good women are. Women's strong qualities have become despised because of their weakness. The obvious remedy is to create a feminine character with all the strength of Superman plus all the allure of a good and beautiful woman.