She looks like Mary Marvel.
When I was younger there was a Saturday morning cartoon in which Billy Batson fought against evil with his brother and his sister. All three had the power to transform, but I believe Billy was the most powerful of the three.
Black Adam, an ancient predecessor to the Marvel Family, appeared as an enemy in a few episodes.
Billy, Mary, and Black Adam all said SHAZAM! to activate and deactiate their powers. For Black Adam power deactivation meant reverting to dust, as his normal human form is so old it aught to be dead by now.
I don't remember the name of Billy's brother. I only remember that he said CAPTAIN MARVEL! instead of SHAZAM! to transform.