Behavior that seems appropriate for a polite, civilized girl or woman is sometimes called ladylike. A little girl might be scolded for not having ladylike manners if she puts her feet up on the table at a fancy restaurant.
The adjective ladylike is an old-fashioned way to describe how a dignified or "proper" woman acts. Your grandmother might praise your best friend's ladylike demeanor, not knowing that in her spare time she drives a demolition derby car and is usually covered with mud. Before ladylike was first used in the sixteenth century, the equivalent adjective was ladily.