Calista Haslum is the negligent, psychotic mother of Emma Haslum. She and her husband Andre poorly cared for Emma, to the point when Calista left Emma in a car, the engine died, and she was killed from heat stroke. Calista took her inside to cool down, but Andre realized what happened when he returned. He buried Emma at a property owned by his aunt, Emily Huntford, then pretended Emma was alive to spare and protect Calista.
When Emily wanted to meet Emma for the first time, the lies unraveled, so Andre pretended Emma was kidnapped. Detectives realized the truth when finding out the Haslum house was barely baby proofed, and the toys and supplies were brand new. Andre screamed at the detectives to stop confronting them, but Calista came to her senses and realized the truth, confessing to her involvement.
Calista was arrested and found guilty of manslaughter and child endangerment and was imprisoned or institutionalized, depending on her state of mind at trial. (CI: "Folie à Deux")