The condition of the girl, undergoing treatment at a private hospital in Visakhapatanam, is very critical, Rayagada District Collector S S Padhi said.
The orphan girl was allegedly gang-raped by some youths while she was returning from work late on January 2. Unable to bear the humiliation, she set herself on fire and sustained about 80 per cent burns.
The girl was later shifted to a private hospital in neighbouring Andhra Pradesh.
Besides the district collector, Odisha's ST and SC Development Minister L B Himirika and chairperson of the State Commission for Women have already visited the hospital at Visakhapatanam.
Meanwhile, the family members of the four accused youths threatened to commit self-immolation saying there was no evidence indicating their involvement.
Rayagada SP Rajesh Pandit said the youths were arrested based on the statement of the victim.
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"The police will submit chargesheet within one month," he said.
A large number of women and students staged a demonstration demanding stringent punishment against the youths involved in the gang-rape of the 16-year-old.