Chepkoech began her career in road running, taking top three placings in 2014 at several low level races in Germany and the Netherlands. She switched to track running in 2015 and set a 1500 m best of 4:03.28 minutes to win at the KBC Night of Athletics. This time placed her just outside the top twenty athlete for the season and she was the fifth fastest Kenyan. A bronze medal in the event followed at the 2015 African Games.