Help me with Great Gatsby question.... How does Myrtle's speech reveal her character?

Myrtle's way of talking offers us "glimpses into the dizzy shallows of her mind"--Langman attends only to what characters say and how they say it (54). Under this treatment, Myrtle's speech reveals her character in essentially the same way that her clothes sometimes do; its content signifies somethi ng like the "elaborate afternoon dress of cream colored chiffon" into which she changes for company (35). But Langman's interpretation of Myrtle's words overlooks the sense in which they are actions as well as statements, doings as well as sayings.