Hospital officials said today that the girl's condition was the same as last night.
"The patient remains in an extremely critical condition. She is under treatment in the Intensive Care Unit (ICU)," the hospital's Chief Executive Officer, Dr Kelvin Loh, had said in a statement last night.
"Prior to her arrival, she has already undergone three abdominal surgeries, and experienced a cardiac arrest in India. A multi-disciplinary team of specialists is taking care of her and doing everything possible to stabilise her condition," said Dr Loh.
Security was tightened at the hospital, with each visitor screened before being allowed into the ICU.
The Straits Times, a daily in Singapore, today reported that the family of the girl, who is battling for life after being gang-raped in a moving bus in Delhi 12 days ago, is shell-shocked, but thankful.
"The father said he is reassured that the best is being done for his daughter and the rest lies in the hands of God," the daily said, citing a source who had met the girl's father and her two brothers.
The father, who is in his late 40s, repeatedly expressed his gratitude to the Indian government and Singapore for facilitating the travel and treatment.
"Aside from the trauma of the rape, they (the family) have to get used to the idea that they are now in a foreign land," the daily quoted the source as saying.
"These are simple people who never boarded an aircraft, much less travel to a foreign country in an air ambulance," the source was quoted as saying.
The family members do not speak English and rely on interpreters to communicate with hospital staff.
The High Commission of India has assigned a liaison officer with the family.