What does this quote mean?

Gatsby knows the sounds of old money when he hears it. Daisy has a specific accent, voice, or lilt that conveys that she lives a life of great privilege, never knowing want. She is highly educated, and this comes across in her enunciation of vowels and consonants. Figuratively, her voice is "full of money" because Daisy herself, as a character, is obsessed with riches and incapable of admitting fault in Myrtle's murder (she doesn't have to, after all; she's rich enough to get away with it), and her voice is reflective of her personality.