Emma May also shares the sense of shock and loss. The 16-year-old walks tall today partly thanks to Diana.
The Princess gave her money towards a pounds 20,000 operation to add six inches to her height - and encouraged and comforted her as she recovered.
"I am in deep shock," she said yesterday. "She was such a warm and caring person.
"William and Harry must be more than devastated, and my heart really goes out to them."
Emma was born with the rare Turner's syndrome, which stopped her growing at the age of 10. Her bravery in the face of painful treatment won her a "Champion Children" award in 1991, which Diana presented.
She said: "I wrote to her afterwards telling her about the operation. I didn't expect her to send any money, but I wasn't surprised, because she was so terribly nice. I wrote back to thank her, and the correspondence went on quite a while.
"They were lovely, chatty letters, but she always asked me not to disclose what she wrote and I never will. Not even if I was offered thousands of pounds for them.
"She was like a friend, and I shall treasure her letters always."