Career
She has a personal best of 4:03.09 minutes for the distance. Born near Mount Elgon, Chepkwemoi had her first success at national level in 2010. The 16-year-old Chepkwemoi took the bronze medal at the 2010 World Junior Championships in Athletics with a personal best of 4:11.04 minutes.
She was chosen for the junior team at the 2011 IAAF World Cross Country Championships, where she placed sixth and helped Kenya to the team silver medals.
On the track, she was beaten by Annet Negesa of Uganda over 1500 m at the 2011 African Junior Athletics Championships, finishing a close second. She also set a personal best of 4:07.63 minutes that season while winning at the Meeting Voor Mon meeting in the Netherlands.
Her IAAF Diamond League debut came that May and she set a 3000 metres best of 8:56.52 minutes to come tenth at the Doha Diamond League meet. She set indoor bests of 4:23.76 and 9:02.28 minutes for the 1500 m and 3000 m at the start of 2013, but missed the rest of the season and also the whole of the 2014 season.
Chepkwemoi established herself as a senior in the 2015 season.
Third place at the 2015 Athletics Kenya World Championship Trials brought her a first senior national team selection. 1500 metres outdoor – 4:03.09 (2015)
3000 metres outdoor – 8:56.52 (2012)
1500 metres indoor – 4:23.76 (2013)
3000 metres indoor – 9:02.28 (2013).