Unnao has hit headlines several times in the last three years for reporting heinous crimes against women.
Heavy deployment of police force has been made at the hospital to ensure the safety and security of the girl.
Two of the poisoned girls died on way to hospital while the third one is battling for life in a Kanpur hospital.
The high court on November 6 issued notice to the CBI on Sengar's appeal against his conviction and jail term and had also asked the agency to respond to his application.
The rape survivor and the advocate were injured on Sunday when a truck hit their car in Rae Bareli.
A CBI team had on Saturday gone to jail in Sitapur, where Sengar has been lodged for over a year, to check the visitors' records and who he has been receiving at the prison.
Priyanka Gandhi had given a call for a state-wide three-day signature campaign starting Saturday as part of a Congress strategy to build pressure to ensure justice to the rape survivor.
Devender was among the three persons, including truck driver Ashish Kumar Pal and cleaner Mohan Shrivas, who was arrested for the accident involving the Unnao rape survivor.
The arrests, made over Monday and Tuesday, included three persons arrested for vandalism, attacks against buses and shops and blocking the roads.
Fourth FIR lodged in Unnao rape case: MLA Kuldeep Singh Sengar's brother to be taken in police custody for interrogation
The Central Bureau of Investigation (CBI) has registered fourth case in connection with the Unnao rape case involving Bharatiya Janata Party (BJP) MLA Kuldeep Singh Sengar.
Senior CBI officials disclosed that the decision for NARCO test was taken in the wake of the contradiction in answers given by the MLA to similar set of questions posed to him during the grilling
Will the POCSO case hold against Sengar in light of new revelations that say that the victim could not be a minor when she was allegedly raped in June, last year.
Unnao rape case: Uttar Pradesh BJP MLA Sengar's goons threatening villagers to keep quiet, says victim's uncle
Family of the 17-year-old rape victim alleged that goons of accused Bharatiya Janata Party MLA Kuldeep Singh Sengar are threatening villagers to keep quiet.
No FIRs and inquiries against policemen result in poor conviction.
The opposition party also hit out at the BJP-led government in Uttar Pradesh over its "indictment" by the Allahabad High Court.