The victim was rescued yesterday by police from a house in Rambagh locality of Darbhanga town, around 140 km north east of Patna, they today.
The Women Police Station SHO Seema Kumari found her in tattered clothes, unkempt dry hair and with overgrown nails.
"The woman could barely open her eyes in the sunlight, as she had survived in darkness and dim light, closeted in the small space. Though married, she had neither vermillion on her head nor 'bindi' on her forehead," Kumari said.
The woman hails from Patsan village in Andrathadi police station area in Darbhanga district. She was married to a Prabhat Kumar Singh in 2010. Soon after the marriage, her husband and in-laws allegedly started torturing her for more dowry, police said.
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The torture increased when the dowry demands were not met and peaked when she gave birth to a girl child.
"She immediately asked for her three-year-old daughter and wept inconsolably when the child could not recognise her," the SHO said.
The woman was rescued after much effort by her father Shyam Sundar Singh, who had finally complained to Darbhanga SSP Kumar Ekle, who in turn instructed the woman inspector to pursue the case immediately.
The police has registered an FIR against the women's husband, father-in-law Dhirendra Singh and mother-in-law Indra Devi and has taken them into custody.