But the court ruled against her and on May 15 she was sentenced. The court allowed a two-year stay of execution after she delivered her baby, Maya.
Ms Ibrahim has sworn that she will not renounce her Christian beliefs, her husband, Daniel Wani, told The Daily Telegraph. "She is doing OK," he said.
But Mr Al Hadi accuses Mr Wani of forcing her conversion. "Her now-husband Daniel - this 'priest' - he gave her a magic potions drink," he told CNN television. "Or something that allowed him to convert her."
He claimed that Ms Ibrahim was originally given the Islamic name Abrar al Hadi and her family was "shocked" when she told the court that her name was now Meriam Yahya Ibrahim.
His sister had cut off all ties with the family and disappeared, he said, until he discovered that her husband's family "were hiding her in their house". He added: "When she was caught, our sister's face was different, the way she looked at us was different. She was bewitched, like an unconscious person. She didn't know any of us."
He said that the family would "not deny Islamic law" - even if that meant the execution of his sister.
"If she dies we will have enforced God's word. The solution is that she is executed. As we have been ordered by our Prophet, peace be upon him, 'He who barters his religion you must kill.'
"The world should not involve itself in our family affairs. This is a family and these are our private affairs. We don't want outside involvement."
His comments will fuel speculation that Ms Ibrahim is the victim of a family feud. An American charity which is paying her legal costs has claimed that she was targeted by jealous relations who wanted to gain control of her successful small businesses - a supermarket, a farm and a beauty salon.
Ms Ibrahim's sentence, including 100 lashes to be administered before she is hanged, has provoked outrage around the world. Her lawyers have appealed against it and are currently awaiting a decision.
Reports last weekend that her release was imminent were dismissed by the government in Sudan. But President Omar al-Bashir was said to be considering issuing a presidential pardon.
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