The victim from Nawalparasi, was undergoing treatment for burn injuries at a Bhairawaha-based hospital in western Nepal.
She succumbed to injuries today, police said.
The woman was attacked by her alleged lover, Sunil Koirala, 28, after she declined his marriage proposal, prompting him to pour acid on her last night, they said.
The victim along with her aunt had come to Rupandehi to meet Koirala. He lost his temper after the woman declined his marriage proposal, police said.
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