Career
She established herself at the World Youth Championships in Athletics in 2001, winning the 3000 metres title. She moved to Japan several years later to compete for the Kyudenko running team Chepyego has twice represented Kenya as a senior athlete: first at the 2006 International Chiba Ekiden, where she broke an African record, and then at the 2013 World Championships in Athletics, where she placed seventh in the 10,000 metres.
At age nineteen, she placed third at the North Rift Valley championships.
In 2006 she emigrated to Japan to take up professional running. She gained her first international selection soon after for the International Chiba Ekiden.
She did not compete in 2008 and changed location for the 2009 season, entering a series of road races in Europe. Chepyego returned to running in Japan in 2010.
She signed up with the Kyudenko corporate running team in 2011 and performed well on the track circuit, almost going undefeated that season with wins at the Oda Memorial, Hokuren Shibetsu Meet, Japan Corporate Track and Field Championships and the Hyogo Relays.
Her sole defeat on the track came at the Nobeoka Golden Games, where she was runner-up to Ann Karindi. On the roads she set a new best of 72:03 minutes to place second to Florence Kiplagat at the Sapporo Half Marathon. Chepyego was Kyudenko"s top performer at the All-Japan Women"s Corporate Ekiden Championships.
In 2011, Chepyego took a 5000 metres/10,000 metres double at the Japan Corporate Championships, but failed in her aim to make the 10,000 m team for Kenya at the 2012 Summer Olympics.
She was runner-up at the Sanyo 10K that year. She focused on the track event in 2013 and was rewarded with her first major international selection.
After winning the 10,000 m at the Hyogo Relays, she placed third at the Kenyan trials. This earned her a place at the 2013 World Championships in Athletics.
In the final she ran a personal best of 31:22.11 minutes, which brought her seventh place overall.
