Passage: In her later years, the Queen Mother became known for her longevity. Her 90th birthday—4 August 1990—was celebrated by a parade on 27 June that involved many of the 300 organisations of which she was patron. In 1995, she attended events commemorating the end of the war fifty years before, and had two operations: one to remove a cataract in her left eye, and one to replace her right hip. In 1998, her left hip was replaced after it was broken when she slipped and fell during a visit to Sandringham stables.Queen Elizabeth's 100th birthday was celebrated in a number of ways: a parade that celebrated the highlights of her life included contributions from Sir Norman Wisdom and Sir John Mills; her image appeared on a special commemorative £20 note issued by the Royal Bank of Scotland; and she attended a lunch at the Guildhall, London, at which George Carey, the Archbishop of Canterbury, accidentally attempted to drink her glass of wine. Her quick admonition of "That's mine!" caused widespread amusement. In November 2000, she broke her collarbone in a fall that kept her recuperating at home over Christmas and the New Year.On 1 August 2001, Queen Elizabeth had a blood transfusion for anaemia after suffering from mild heat exhaustion, though she was well enough to make her traditional appearance outside Clarence House three days later to celebrate her 101st birthday. Her final public engagements included planting a cross at the Field of Remembrance on 8 November 2001; a reception at the Guildhall, London, for the reformation of the 600 Squadron, Royal Auxiliary Air Force on 15 November; and attending the re-commissioning of HMS Ark Royal on 22 November.In December 2001, aged 101, Elizabeth fractured her pelvis in a fall. Even so, she insisted on standing for the National Anthem during the memorial service for her husband on 6 February the following year. Just three days later, her second daughter Princess Margaret died. On 13 February 2002, the Queen Mother fell and cut her arm in her sitting room at Sandringham House;...

Question: How long after her father's death did Princess Margaret herself die?
three days