"Grief is the price we pay for love," the Duchess of York, Sarah Ferguson, told the mourners, quoting her former mother-in-law -- the late Queen of England Elizabeth II, who famously used those words to address the families of victims of the 11 September, 2001 attacks on the United States.

Presley, who led a tumultuous life in the sprawling shadow of her world-famous father, and who attended a high-profile awards ceremony just this month, had been rushed to a California hospital's intensive care unit for cardiac arrest and died shortly after.

She was Elvis's only child. She previously controlled Elvis Presley Enterprises, but sold the bulk of shares in the company to a private equity firm in 2005.

She retained control of Graceland, the estate her father owned and where he was found unconscious in August 1977.

Elvis was taken to a hospital but pronounced dead from a heart attack. Toxicology reports found high levels of prescription drugs in his system.

Lisa Marie released three albums this century, and is the mother of actor Riley Keough, who appeared in "Mad Max: Fury Road."

In addition to Danny Keough, whom she divorced in 1994, she has also been married to actor Nicolas Cage, pop superstar Michael Jackson and actor-composer Michael Lockwood.

She was left devastated following the death by suicide of her son Benjamin less than three years ago.

Reports said she was buried next to him at Graceland.