Teenager Yashika Bageerathi is said to be “very frightened” after landing in Mauritius following her deportation on Wednesday night.
Several last minute efforts were made to prevent her being sent to her native country, including an emergency court order and an appeal from chairman of the Home Affairs Select Committee Keith Vaz.
The 19-year-old was taken on an Air Mauritius flight and is looking for somewhere safe to stay following a police interview at the airport, her headteacher said.
Friends, family, politicians and her school have all campaigned to prevent her deportation, to no avail.
Ms Bageerathi came to the UK with her mother, sister and brother in 2011 to escape a relative who she said was physically abusive, and claimed asylum last summer.
Lynne Dawes, headteacher at Oasis Academy Hadley in Enfield, north London, said the school was in regular contact with the promising student and that the immediate concern was to find her a safe place to stay.
But Ms Dawes added they were working to ensure she would still be able to complete her A-levels.
She described the student as feeling “low” and said: “She’s feeling the lowest I have heard her be for quite a while.”
The headteacher confirmed four security guards had accompanied Ms Bageerathi on the flight.
Previous attempts to deport Ms Bageerathi were thwarted when Air Mauritius refused to fly her out following an earlier refusal by British Airways – but Air Mauritius confirmed it had received a “directive” from the UK authorities that the youngster must leave.