and yeah. Carol is only Marvel's "Biggest" female hero because they're pushing her that way right now.
The teen Islamic Ms. Marvel is more popular than her, due to Marvel's media blitz prior to her first issue.
Invisible Woman is more popular than her, but solely due to people knowing the FF symbol. But they couldn't name a FF story outside the movies.
People know who She-Hulk is, but only because she's big, green and strong. who else could she be?
Black Widow's known from the movies right now. But people only know she's a russian spy.
Any person on the street could pick Storm out of a stack of drawings and tell you what she's about, whats her origin, her powers, etc. regardless to if she's in a costume or not.
She's by default Marvels most well known and recognized female character.