Satyam Yadav, 27, hanged herself at her Nangloi home in west Delhi on Thursday morning after strangling her daughter. She represented Nangloi (East) in the North Delhi Municipal Corporation.
Her husband Pawan Yadav, a teacher, has been charged with dowry death and cruelty towards his wife.
Mrs Yadav's family has alleged she was harassed by her in-laws for dowry and giving birth to a girl child.
"Satyam's in-laws were demanding Rs 10 lakh and a car. We went to Delhi to bring her back to Bulandshahr. They refused to let her come and said they will not leave her until their demands were fulfilled," her brother Nishat Yadav alleged.
(With agency inputs)