Thanks to everyone.

Of all the good ideas proffered, I ended up quoting briefly from Remember by Christina Rossetti, and also used both the Native American Prayer and the wonderful short piece by Leo Marks. These seemed best to help convey the sense of continuity through the hearts and minds of all of us whom Kate touched in her short life. Her younger brother David spoke very movingly also - she had once saved his life a few years ago.

I spoke the words of Yours and yours and yours directly to young Colin at the final moments of the service, letting the words fall away to a whispered finish, and he was gently smiling back up at me. I nearly cracked with the rest of the congregation. I was so reminded of the way Kate used to wrinkle her nose when she smiled. He is a loving and remarkably poised young man, and his mum has the finest of all possible testaments to the love that drove her forward through nine years of agony.