Career
As of June 2015, her personal best time of 9:15.08 ranks her 19th on the world all-time list. Early in her career, Jepkemoi competed in a variety of events. Her main event was the 5000 metres, in which she placed fifth at the 2011 Kenyan Championships.
In 2012 Jepkemoi started concentrating on the steeplechase and her times improved.
Her best time that year was 9:23.53, which she ran at the Gugl Games in Linz. At the Kenyan Olympic Trials, however, she only placed fifth and failed to qualify for the Olympic team
Track & Field News ranked Jepkemoi ninth in the world for 2012, her first top ten ranking. In 2013 Jepkemoi only placed fourth at the Kenyan Championships but third at the World Championships Trials, qualifying for the Kenyan team to the 2013 World Championships in Athletics in Moscow.
At the World Championships, she placed sixth with a new personal best time of 9:22.05.
She ended the year ranked seventh in the world, up two places from the previous year. Jepkemoi opened 2015 with a near-personal-best of 9:22.11 at the Doha Diamond League meeting, placing third behind Virginia Nyambura and Ayalew. As of 8 June 2015, Jepkemoi"s personal best in the 3000 m steeplechase (9:1508) ranks her 19th on the world all-time list.