Rubuta ci gaba don wannan sakin layi - Shekaru 13 kawai, Chemchumba ya yi gasa a gasar tseren tseren tseren ƙasa ta IAAF ta 1992
, ya gama na 27 a tseren matasa. Har yanzu a matakin matasa, ta halarci gasar 1994 da 1995 na Gasar Cin Kofin Duniya ta IAAF, inda ta kammala na 7 da na 10. A lokacin ta yi hutu a cikin gudu don mai da hankali kan karatu, inda ta kasance a baya. Ta halarci Makarantar Sakandare ta Kapkenda a shekarar 1997.