But Anthony revealed the entire range of emotion in videos of jailhouse conversations between her and her parents, which were released Dec. 5.
In the more than 300 minutes of video released by the Orange County Sheriff's Department, Casey Anthony is shown laughing, crying and growing frustrated with the investigation and her family's questions.
When her mother, Cindy Anthony, confronted her with lead Detective Yuri Mellich's suspicions that she had had something to do with Caylee's disappearance, her daughter dodged the issue.
"Yuri [Mellich] has it set in his mind. He thinks you've done something to Caylee," Cindy Anthony told her. At that point, her daughter got up and, when she returned, steered the conversation in a different direction.
Casey Anthony also said that she knows the conversations are being recorded and said, "there are things [she] directly needs to say" to each of her parents.
When gruesome details about the discovery of Caylee's remains were released in January, Casey's father, George Anthony, nearly committed suicide.