[2][3] She won the gold medal in that event at the 2013 World Youth Championships in Athletics, running 6:14.60 minutes (the fourth fastest time ever) to defeat her compatriot Daisy Jepkemei.

[4][5] It was her second gold medal for Kenya that year, as she was a team winner at the 2013 IAAF World Cross Country Championships, where she placed seventh individually at age fifteen.

[6] A fourth-place finish in the junior race at the 2014 African Cross Country Championships brought her another team gold.

[7] Chepngetich won two gold medals in the 2000 mm steeplechase in the 2014, taking the title at the 2014 African Youth Games before winning at the 2014 Summer Youth Olympics (holding off Ethiopia's Zewdenesh Mamo both times).

[13] A third-place finish in a steeplechase personal best of 9:35.75 minutes at the 2015 Athletics Kenya World Championship Trials brought her her first senior national selection.