In 1992, Tilberis moved to
New York City and took the helm of fashion institution ''
Harper's Bazaar. In December 1993, she was diagnosed with ovarian cancer at age 46. She strongly believed that her use of fertility drugs caused the disease. She spent the next seven years at Bazaar'' balancing chemotherapy and revitalizing the 125-year-old magazine. In January 1995, at the
CFDA Awards, Tilberis received a special award for her achievements at
Harper’s Bazaar from her friend
Diana, Princess of Wales. Tilberis served as President of the
Ovarian Cancer Research Fund from 1997 until her death in 1999. She escorted Diana, the Princess of Wales, on one of her last visits to
New York City, even though Tilberis herself was undergoing
chemotherapy treatments for her cancer. Diana would telephone and write to Tilberis to give her words of comfort and encouragement, until her own death in a car accident on 31 August 1997. ==Death==