According to an FIR by the victim's father, Sunil Das, of Ramajotha village lodged with the Bagdogra police he found his daughter on fire at the house of his neighbour Santosh Barui after being informed by other villagers.
The woman was admitted to the North Bengal Medical College Hospital with severe burns, the sources said.
The father alleged that his daughter was kidnapped by Barui on December 14 and gangraped by him and his friends after drugging her.
When the woman regained her senses and tried to escape, Barui allegedly poured kerosene and set her alight, the FIR said.
The victim's father had earlier lodged an FIR on December 14 stating that his daughter was missing.
The sources said that the case was being investigated.