Amy Winehouse's family believes she died from alcohol withdrawal

(CBS) Amy Winehouse's cause of death won't be known for weeks, pending toxicology tests, but the singer's family reportedly believes she died from alcohol withdrawal.

A source close to Winehouse's family told Britain's The Sun that Winehouse ignored her doctor's advice to cut down on her heavy drinking gradually and instead stopped drinking entirely.

Pictures: Amy Winehouse, 1983-2011
Pictures: The singer's funeral
Pictures: Stars mourn Amy Winehouse
Pictures: The death of Amy Winehouse

The singer's family believes that it was too much of a shock to her system, the unnamed source added.

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

The Sun reports that her father, Mitch Winehouse, dismissed reports that his daughter had gone on a 72-hour bender before her death, and said in his eulogy at her funeral that he believed the opposite happened.

"He 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 family source told the paper, adding, "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 found dead in her London home on Saturday, at age 27. An autopsy was conducted Monday but the cause of death remains unexplained. The coroner is looking for toxicology tests, which take several weeks, to provide more information.