Disbelief among those who know Tracy suspect

She is described as a straight-laced preacher's granddaughter, a member of her high school dance team who never got into trouble. She is passionately devoted to her 5-year-old daughter. She has no serious criminal history, just a couple of petty thefts, and no violent mental illnesses that several of her closest relatives know of, just depression. It leaves those who know her to wonder: If she is responsible, did Huckaby have a sudden psychotic break from a hidden mental illness and go crazy, raping an 8-year-old playmate of her daughter, killing her and throwing away her body in a suitcase?