Kammala jumla mai zuwa: Rumokol ta fara fitowa a gasar cin kofin duniya ta Kenya a gasar tseren tseren kasa ta IAAF ta 1999, inda ta kammala ta goma sha biyu a tseren matasa. A cikin
Gasar tseren tsere ta Duniya ta 2003 ta kammala a matsayi na shida a tseren tsere mai tsawo, yayin da kungiyar Kenya, wacce Rumokol ta kasance wani bangare, ta lashe lambar azurfa a gasar kungiyar. Ita ce ta lashe gasar 2005 a Oeiras International Cross Country. Ta yi gwagwarmaya don kaiwa saman filin tseren tseren ƙasa kuma ta fara shiga cikin tseren hanya, inda ta lashe gasar Tegla Loroupe Peace Race a shekara ta 2004. Ta ɗauki hutu na shekaru uku daga wasan daga Disamba 2005 zuwa tsakiyar 2008.