Singer Amy Winehouse poses with her award for Best Contemporary Song at the Ivor Novello Awards at the Grovesnor House Hotel on May 24, 2007 in London.

Amy Winehouse and husband Blake Fielder-Civil watch the show at the MTV Europe Music Awards 2007 at the Olympiahalle on November 1, 2007 in Munich.

Amy Winehouse is seen during the 53rd Ivor Novello Awards after she won Best Song Musically and Lyrically at the Dorchester Hotel on May 22, 2008.

Amy Winehouse performs during the 46664 concert in celebration of Nelson Mandela's life at Hyde Park on June 27, 2008.

Amy Winehouse performs on the Pyramid stage during day two of the Glastonbury Festival at Worthy Farm in 2008.

Amy Winehouse drinks a pint of lager as she watches The Libertines perform live at The Forum on August 25, 2010.

Amy Winehouse performs on stage during Rock in Rio Day 3 on July 04, 2008 near Madrid.

SUPPORTIVE PARTNER: Amy Winehouse leaves Snaresbrook Crown Court in London in 2008 after attending a court hearing for her husband Blake Fielder-Civil.

COURT DATE: Amy Winehouse arrives at the City of Westminster Magistrates Court in central London in 2009.

SAD MOMENT: Funeral workers carry the body of Amy Winehouse outside her house in London.

SAD DAY: Fans react as they gather outside the home of Amy Winehouse following news of the singer's death.

Flowers and messages are seen outside the home of Amy Winehouse.

GRIEF: Mitch (right) and Janis Winehouse, the parents of British singer Amy Winehouse, look at memorabilia left by fans outside her house in London July 25, 2011.

Mitch and Janis Winehouse (centre), the parents of British singer Amy Winehouse, look at memorabilia left by fans outside her house in London

From left: Father Mitch Winehouse, brother Alex, former boyfriend Reg Traviss and mother Janis look at look at memorabilia left by fans of Amy Winehouse.

LAST RESPECTS: A man holds an invitation bearing a picture of British singer Amy Winehouse before her funeral at Golders Green Crematorium, in north London.

Amy Winehouse's family reportedly believe the singer died due to her body not being able to handle withdrawal symptoms from alcohol.

Family sources have told British newspaper The Sun that Winehouse ignored her doctor's advice to cut down on her heavy drinking gradually.

They believe she died from a seizure due to her tiny body not being able to handle the shock of a drastically reduced intake of liquor.

1 of 8 Reuters LAST RESPECTS: A man holds an invitation bearing a picture of British singer Amy Winehouse before her funeral at Golders Green Crematorium, in north London. 2 of 8 Reuters HUG IT OUT: Mourners attend the funeral of Amy Winehouse in London. 3 of 8 Reuters LAST GOODBYES: Mark Ronson and Kelly Osbourne attend Amy Winehouse's funeral in London. 4 of 8 Reuters SAD DAY: Mourners attend the funeral of Amy Winehouse in London. 5 of 8 Reuters Mitch Winehouse (R), the father of singer Amy Winehouse, arrives for her funeral at Golders Green Crematorium in north London. 6 of 8 Reuters Janis Winehouse, the mother of Amy Winehouse, leaves Golders Green Crematorium after her cremation. 7 of 8 Reuters Kelly Osbourne leaves Golders Green Crematorium with other mourners after the cremation of Amy Winehouse. 8 of 8 Reuters Reg Traviss, the former boyfriend of Amy Winehouse, leaves after her cremation at Golders Green Crematorium.

Winehouse, who had a highly-publicised battle with alcohol and drug addiction, spent a week in a rehabilitation centre earlier this year and her father Mitch said he believed she was on the road to recovery. During his eulogy at her funeral Mitch revealed she hadn't drunk for three weeks before her death.

"Abstinence gave her body such a fright they thought it was eventually the cause of her death," the source said.

The Back to Black singer was found dead on Saturday aged 27 in her North London home.

"[Mitch] said doctors had told Amy to gradually reduce her intake of alcohol and to avoid bingeing at all costs. Amy told him she couldn't do that. It was all or nothing and she gave up completely," the insider added.

"Mitch said the shock of giving up, after everything she had been through over a bad few years, was just too much for her to take."

Winehouse was cremated and her ashes will be buried by those of her grandmother Cynthia, who she was close to.

The post-mortem carried out on Winehouse's body was deemed inconclusive with toxicology test results expected in a few weeks which will determine the cause of death.

Police are currently investigating the circumstances around her death. While it's not thought her passing was suspicious, they want to piece together what happened during Friday evening.

It's known she was visited by her doctor and given the all clear, but police want to find out who she saw afterwards.

Mitch has said she stayed at home playing drums and singing before going to bed, where her security guard found her the next day, but friends believe she may have gone out.

"There is a possibility she left her home at some point during the evening and some of her friends believe she may have headed out later," a source told The Daily Mirror.

It's understood officers have already spoken to Winehouse's security man and doctor, and also another individual.

SUFFERING FROM HALLUCINATIONS

Winehouse was suffering from "intolerable hallucinations" in the run up to her death, it has been claimed.

A source told British newspaper The Daily Mirror that Winehouse regularly experienced hallucinations during the night, seeing people in mirrors and mice on the floor. She also struggled to sleep properly.

"The hallucinations were truly terrifying for Amy. The line between reality and fantasy was increasingly blurred and she found it absolutely intolerable at times. No one can really appreciate how tough it has been for her," the source said.

"Even if she never touched drugs or alcohol again, she knew that her health had been ruined. There was only so much battering it could take and these side effects were a sorry testament to that. Physically, she was a wreck. It was just heartbreaking."

During Winehouse's funeral on Tuesday her father insisted her life had taken a turn for the better recently. He praised her on/off boyfriend Reg Traviss, saying he and Winehouse had found love.

"Mitch was absolutely right that she had been happier, particularly since she had started seeing Reg. They had their ups and downs, of course, but we were all hoping that she would have a brighter future. But the problem was that all her years of abuse had really taken their toll. She no longer enjoyed the carefree life she once did," a source told the publication.

SINGER 'SPENT LAST WEEK WRITING'

Winehouse spent the days leading up to her death at home playing drums and writing songs for a third album that will never be finished.

Her long battle with alcohol and drugs led to speculation she may have passed away from an overdose or after a drinking binge.

But during his eulogy at her funeral, her father Mitch insisted the reports were misplaced, saying she spent Friday night playing drums and singing at home.

It seems that was a regular occurrence for the star, with suggestions much of her time over the last few weeks was spent penning lyrics.

"She spent most days at home writing," a friend told People magazine.

Winehouse had been working on her eagerly anticipated third album, a follow up to 2006's Back to Black, recently. It was due to be released earlier this year, but that never transpired. It's understood Winehouse had told her record company she wanted to work on some of the lyrics as she felt they were too concerned with her ex-husband Blake Fielder-Civil.

Meanwhile, Cee Lo Green has spoken of his sadness following the star's passing. Despite rumours earlier this year claiming Winehouse and Green had recorded a track together, Green has revealed they never made it to the studio but they had been keen to collaborate.

"We were discussing working together. We have a mutual friend, [producer] Salaam Remi.

"There was a rumour that we had already recorded together. It wasn't true and I don't know where that came from. But we did grow fond of each other and thought we could work together," he told E! Online. "I could listen to her and she registered to me as the real thing ... It's so untimely and unfortunate. What a loss. Music has lost a daughter."

Winehouse had recorded a duet with Tony Bennett for his new record, and she spoke about the experience with British newspaper The Telegraph in March of this year.

"I'm my own worst critic and if I don't pull off what I think I wanted to do in my head, then I won't be a happy girl," she said. "I've got Tony's voice right in my ear and that's so much for me that I can't look up and see Tony the person as well. I sound so stupid but it's hard.

"I'm not a natural born performer. I'm a natural singer, but I'm quite shy, really. You know what it's like? I don't mean to be sentimental or soppy but it's a little bit like being in love, when you can't eat, you're restless, it's like that. But then the minute you go on stage, everything's OK. The minute you start singing."

Black to Black has now re-entered the Top Ten of the Billboard 200 after selling more than 37,000 copies in America. The album has also topped iTunes charts around the world since her death.