Irene Clennell, 53, was removed from Britain on Sunday after being sent to an immigration detention center.
"They deported her with £12 (USD 15) in her pocket and no change of clothes," her husband, John, told The Associated Press.
Britain's Home Office said people with no legal right to remain in the country were expected to leave.
"All applications for leave to remain in the UK are considered on their individual merits and in line with the immigration rules," a statement said.
She spent periods in Singapore throughout her marriage, reportedly to care for elderly parents. Speaking in Singapore after her arrival early today, Irene Clennell said British officials had accused her of being "violent and disruptive" before putting her on the plane.
"They said they would help me get a job and integrate me into Singapore society and it was all a lie," she said. "The people who escorted me to the airport told me there would be someone to meet up with me but they did not do anything."
"We will continue to fight as hard as we can to bring Irene home where she belongs," she said.
Clennell's husband has serious health problems following bypass surgery and Irene is his sole caretaker, she said, adding: "Without her to look after him, we're all worried for him."
The British government's spousal visa system requires that a foreign spouse spend substantial uninterrupted time in the country, and that the British spouse earn at least £18,600 (USD 23,000) a year.
Clennell had been granted indefinite leave to remain in Britain in 1992, but this lapsed after she stayed outside the country for more than two years.
She has had no legal basis for remaining in Britain since July 2014 when her appeal rights were exhausted.
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