A 29-year-old woman allegedly killed her 62-year-old handicapped mother-in-law on Tuesday at their residence in Mandawali’s Shanti Nagar because she was “tired of being abused”. The accused was arrested on Wednesday, the police said.The police said Kanchan Kapoor first attacked her mother-in-law, Swarna Kapoor, with a wooden walker that the victim used. Then, to allegedly make it look like a murder committed by a third party, she attempted to burn the body with mustard oil.According to family members, Kanchan, who has been married to Swarna’s son Sumit since 2009, was always at loggerheads with the victim over domestic issues but mostly because the accused allegedly ill-treated her children.‘Violent person’Sumit, the sole bread winner of the family who works at a restaurant, said his wife was a “violent” person and that she never liked his mother. “My wife was very violent with our children and used to hit them a lot because of which my mother often rebuked her. Last night, it turned very ugly because of her bad temper and now my children and I have to suffer because of her,” he said, adding that he planned to divorce her soon.As told to Mr. Sumit by his children, Kanchan was beating one of them on her second floor residence. Swarna then shouted at her from the ground floor flat. Enraged, she came down and hit her mother-in-law after which she collapsed. The woman then brought a bottle of mustard oil and set her ablaze but only managed to burn parts of her legs and a few items in the room.