Daniel's international debut came as a junior at the 1999 IAAF World Cross Country Championships, where she ranked tenth individually and helped Kenya to the team silver medal. She later focused on the 10,000 metres track distance and improved from 33:22.3 minutes in 2004 to 33:10.5 minutes in 2006. That same year she ran her first marathon race at the Nairobi Marathon and placed seventh in a time of 2:42:31 hours.