Mala's body was found hanging at her rented accommodation at Raj Nagar in Palam village area yesterday evening, said a police officer.
She had left behind a suicide note but did not mention the reasons behind the extreme step, he said.
However, her brother Vishal Verma alleged that Mala was tortured by her husband Sanjiv and his family for dowry.
He also alleged that the victim had talked to her elder sister yesterday afternoon and sounded "completely hopeless".
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Mala's phone was snatched away by her husband and she was not allowed to go to her native place in Kanpur for family functions, Vishal said.
A case has been registered under sections 498(a) (cruelty), 304(b)(dowry death) and 34 (act done by several person with common intent) of IPC at Palam police station against Sanjiv and his fanily, Surender Kumar, DCP (south west) said.
Mala got married to Sanjeev in 2011. They have a four-year-old son.