Rumokol made her international debut for Kenya at the 1999 IAAF World Cross Country Championships, finishing twelfth in the junior race. At the 2003 World Cross Country Championships she finished sixth in the long race, while the Kenyan team, of which Rumokol was a part, won the silver medal in the team competition. She was the 2005 winner at the Oeiras International Cross Country. She struggled to reach the top of the national cross country running scene and began taking part in road races, winning the second edition of the Tegla Loroupe Peace Race in 2004. She took a three-year break from the sport from December 2005 to mid 2008.