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Answer: A combination of factors is at play here. Carrie's mother, Margaret, is mentally unstable. She is a staunch fundamentalist Christian. Her daughter, Carrie, is a product of forced intercourse by her drunken husband which her mother admits to having enjoyed, regardless of its sinful nature. Carrie exhibits telekinetic powers, which Margaret labels witchcraft. Carrie goes to the prom against her mother's wishes, which Margaret considers sinful. Margaret ultimately sees her daughter as an evil spawn, imbued with Satanic powers, who is also beginning to assert her independence and defy Margaret's Christian principles. It was probably part of Margaret's delusion that killing her daughter in the midst of prayer (they are reciting "The Lord's Prayer" when Margaret stabs Carrie in the back and continues to attack her) might facilitate her possibility for redemption.
Michael Albert