According to the police, the woman, Ranu Sain, a resident of Badnagar in Ujjain district in Madhya Pradesh, was married off to Daru Singh of Chandarpura village on October 17.
The groom's family allegedly "purchased" the bride for Rs 80,000, they said, adding that the deal was brokered by 40- year-old Kalibai, a woman hailing from Dug town.
Dug police station SHO Luv Kumar Tiwari said Ranu Sain's elder brother Ravi and his friend Dharmendra reached her in- laws' house on October 26.
They had mixed some poisonous substance in tea served to the family members, police said, adding that the trio failed in their bid after some villagers visited the house and caught them.
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Ritu Sain's in-laws were undergoing treatment at a hospital, police said.
A case was registered against the trio from Madhya Pradesh and Kalibai at Dug police station under IPC sections 328 (causing hurt by means of poison, etc., with intent to commit an offence) and 120B (punishment of criminal conspiracy) yesterday.