The girl's condition in the morning was "better than yesterday's" but as the day progressed, her health condition kept fluctuating, they said.
The victim, who was admitted to Safdarjung Hospital on Sunday after she was brutally assaulted and raped, continues to be in the Intensive Care Unit (ICU).
"Her condition is critical and deteriorating. In the morning, she was better but, in the evening, the situation fluctuated and her health deteriorated," Dr B D Athani, Medical Superintendent of the hospital, said.
He told PTI that the victim now needs "full-time ventilatory support" and she is under "close observation" of the doctors.
Earlier, Athani had said she will be kept under "close observation" by the doctors for the next 48 to 72 hours because of the nature of injuries inflicted on her.
Athani said doctors were reviewing her case periodically and ensuring she gets best of the treatment. "We still cannot call her out of danger because of the nature of injuries," he said.
Doctors said the paramedical student from Dehradun, who was here for her internship, has suffered severe injuries on her head and in the face as he was brutally attacked by the men with an iron rod.
