A 28-year-old primigravida from rural Uttar Pradesh delivered a live female infant at home with the assistance of a traditional birth attendant. The mother experienced severe postpartum hemorrhage 6 hours after delivery and died on the 3rd postpartum day from septic shock secondary to uterine infection. The district health officer is compiling maternal mortality data for the year. Which vital statistic should this death be classified under, and what is the correct definition?