The victim, Chandrika Parmar, was burnt alive in the Ambedkar Nagar area of Sayla town in Surendranagar district by Motibhai Sunera and seven others, police said.
"The girl was busy cleaning drains when eight people led by Sunera rushed towards her and began abusing her after which they poured kerosene on her and set her ablaze," Sayla town police station's sub-inspector A B Gohil, who is investigating the case, said.
"Initially, the seriously injured girl was rushed to the Sayla Civil Hospital from where she was referred to Ahmedabad's V S Hospital," Gohil said.