According to hospital officials, Gandhi reached the hospital in south Delhi around 10 p.m. and discussed the condition of the girl, who is on ventilator support, with attending doctors and hospital authorities. She left around 10.30 p.m.
Earlier, hospital authorities said the condition of the girl, who was thrown off the moving bus, has "slightly deteriorated" and continues to be critical.
The brutal rape and torture occurred Sunday night when the girl and her friend boarded a private bus at Munirka in south Delhi to go to Dwarka in west Delhi after watching a movie.
The woman was beaten up and raped by at least six men inside the bus. Four accused have been arrested.