What did Mildred tell Montag when he asked if she had seen Clarisse?

In "Part 1: The Hearth and the Salamander," Montag is lying in bed next to his wife, and he tells Mildred that he hasn't seen their neighbor, Clarisse, in four days. Montag asks Mildred if she's seen Clarisse and Mildred tells him that she has not. Mildred mentions that she forgot to tell Montag something. Mildred then tells Montag that she thinks Clarisse's family is gone because Clarisse is dead. Montag is shocked and says that they couldn't possibly be talking about the same Clarisse. Mildred tells him Clarisse McClellan was ran over by a car four days ago, and she thinks Clarisse is dead. Mildred says she's pretty sure Clarisse died, but forgot to mention it to Montag. After telling her husband the startling news, Mildred casually puts her Seashell radio back into her ear and dozes off. Mildred's attitude towards Clarisse's death is apathetic and insentient.