Whakaotihia te rerenga e whai ake nei: I puta tuatahi ia ki te ao i te whakataetae rangatahi i te 2003 IAAF World Cross Country Championships, i te wa i mutu ai ia i te tuarima o nga waahi ka wini i te mētara hiriwa a te roopu rangatahi me Peninah Jepchumba. I whakataetae ia i nga huihuinga i Spain me Portugal i te 2004, i oma i te 1500 mita, 3000 mita me etahi 10K rere. I te tau e whai ake nei ka ngaro ia i tetahi waahi ki te roopu motu i te whenua whakawhiti engari i whakatauhia e ia te 3000 mita pai o te 8:53.46 meneti i te Huihuinga Gaz de France i Paris. Whai muri i tana waahi tuarua i te Kenya Athletics Championships, i eke a Chebet ki tana tuunga tuatahi ki te whakataetae toa o Awherika 2006, i reira ia te toa parahi i muri i ona hoa o Kenya a Edith Masai me Isabella Ochichi. I te tau 2007, kaore ia i oti i te wera o Mombasa i te
2007 IAAF World Cross Country Championships, engari i wikitoria ia i te 10,000 m. I mutu ia i te tuaiwa i te 10,000 m i te 2007 World Championships. I tana haerenga whakamutunga o te tau, i awhina ia i a Kenya ki te waahi tuarua i te Chiba Ekiden Relay, i muri i tana oma i te waewae 5 km.