Kemi Ayinde, her partner Taiwo Salami and daughter were living in
Cardiff before being taken to a Bedfordshire detention centre on 17
June.
In a letter seen by the BBC refusing her asylum claim, the Home Office
said there was state protection in Nigeria.
The UK Border Agency said it would not remove someone at risk of
serious harm.
Ms Ayinde, 24, who is pregnant with her second child, was trafficked
to the UK in 2001 and worked as a prostitute in a house in London
until her escape in 2004 when she became homeless.
She said in an interview with the Home Office that she was told by a
woman she met in Nigeria and who trafficked her she would have to work
as a prostitute for three to four years in order to pay for being
brought to the UK.
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