Kevin Blake mentioned this story on the latest episode of the Final Furlong podcast (highly recommended listening for any horse racing fans out there by the way, check it out).
She was named by her French-Canadian owner after a children's TV character. As a daughter of Northern Dancer from the same crop as Nijinsky she was bred in the purple. Success on the track saw her became a champion filly and she went on to great success at stud before events took an unexpected twist in a paddock at Claiborne Farm, Kentucky, in July 1977.
It's an amazing story and a reminder of how racehorse pedigrees can turn on chance and luck; no matter how much science, angst and planning breeders might put in. Read the full story here in Kevin's blog: http://www.attheraces.com/blogs/kevin-blake