F. Scott first describes "Daisy's voice was only to make people lean toward her; an irrelevant criticism that made it no less charming," saying that there was something about Daisy's voice. At this point in the book, the narrator, Nick, nor the readers know what it is that makes Daisy's voice so special (Fitzgerald, 9).
Daisy has always been in a very unhealthy relationship. Daisy's husband, Tom has been cheating on her. Later, Fitzgerald writes "I think that voice held him most, with its fluctuating, feverish warmth..." and this is when the Readers see that Daisy is also cheating on her husband with Gatsby (Fitzgerald, 98).
Throughout the whole book, Daisy's voice is her synedoche, or something used most to describe her. F. Scott states "Her voice is full of money," and this is when readers truly understand Daisy. They now see how much of a gold digger Daisy is (Fitzgerald, 120).