The extraordinary life of Dorothy Eady ..............(Om Seti).   Tales of reincarnation and past-life memory are rarely proven. In some instances the recollection seems fanciful and speculative, in others the information may be provocative and the details unique.    One of the most convincing examples of the latter in modern times is the extraordinary life of Dorothy Eady, an Englishwoman born at the turn of the 20th century who later became known to many as Omm Sety. Portions of her life have been documented in books and on film in recent times, describing her conscious memory of a life as a priestess in ancient Egypt, which began to awaken at the age of three following a serious fall. She told the dramatic story of how it came about candidly to many people, and made no apologies for her peculiar interest in this past life or for her remarkable affinity with a well-known monarch of Egypt's 19th Dynasty, Pharaoh Sety I (c. 1320-1200 B.C.E.).    I came to know...