The Tennessee Department of Correction has canceled a hearing that had been mistakenly scheduled to determine whether to shorten the sentence of a woman convicted of killing her stepdaughter by forcing her to drink grape soda. Mary Vaughn was sentenced six months ago to 15 years for aggravated child abuse and 20 years for second-degree murder. It was not immediately clear when a new hearing would be scheduled. Prosecutors said Vaughn and her husband forced 5-year-old Alexa Linboom to drink grape soda as punishment. Vaughn’s husband was also sentenced to 35 years.