Mad About Horses -- One of the few jobs a girl can't hope to succeed in these days is that of jockey. Betty Worrall of Oakleigh, Melbourne, does the next best thing - she rides racehorses in track work.Betty Worrall with West Australian jockey Frankie Treen. She says he's the most intelligent jockey of them all. Betty is on Klutos and Treen is riding Sister Ruth.Sitting in jodhpurs and polo - necked sweater over her typewriter in Melbourne's Victoria Markets, we found Betty Worrall, 19, gold-haired, blue-eyed, with a rosy face and a slight, strong figure. June 7, 1951.