(NEWSER) – Leanna Harris—unlike her husband—has not been charged in the death of her 22-month-old son in a hot car but investigators are puzzled by some of her behavior. Police say she had done online research on children dying in hot cars and on the day her son, Cooper, died, she calmly said, "Ross must have left him in the car. There's no other explanation," after being told he had never arrived at day care, the Atlanta Journal-Constitution finds. When she was briefly reunited with her husband at the police station, police say she asked him "Did you say too much?" Some of her remarks at her son's funeral also raised eyebrows. As her husband listened in from jail, she said she wouldn't bring Cooper back even if she could. "He's in the most peaceful, wonderful place there is," she said.