Police suspect that Bhagya Laxmi took the extreme step last night, her first marriage anniversary, due to harassment by her husband and in-laws.
She wrote on wall of her room about the harassment she was allegedly subjected to by her husband Shashidhar, and in-laws, according to police.
Bhagya Laxmi had a love marriage with Shashidhar.
In a complaint lodged with police, her father has accused Shashidhar and his parents of pressurising her to bring additional dowry.
"Based on the complaint, a case of dowry death has been registered. We will proceed further on the basis of evidence," he said.
Nobody has been arrested so far.