Wiktionary
alt. A woman who behaves in a predominantly feminine manner; a feminine woman. n. A woman who behaves in a predominantly feminine manner; a feminine woman.
Wikipedia
Girly girl is a slang term for a girl or woman who chooses to dress and behave in an especially feminine style, such as wearing pink, using make-up, using perfume, dressing in skirts, dresses and blouses, and talking about relationships and other activities which are associated with the traditional gender role of a girl.
Though the term is sometimes used as a term of disdain, it can also be used in a more positive way, particularly when exploring one of a range of gender positions. Being a 'girly girl' can then be seen as a fluid and partially embodied position - a form of discourse taken up, discarded or modified for tactical/strategic ends.
Usage examples of "girly girl".
She was a part of the reception team, when a girly girl was needed to calm down a frustrated arrival or to postpone a quarrel.
The truth was that she was not a girly girl - most of her friends were male.
Creeley was a lady, and a reasonably girly girl at that, with dresses sharing her closet with the suits she wore to work, and the jeans she wore for play.