She began her career as a junior
cross country runner, placing third at the 2008
Athletics Kenya series meet in 2008 and managing fifth at the 2009
Discovery Cross Country Championships. By the end of 2009 she had improved her best for the
3,000 metres steeplechase to 10:13.6 minutes. She won the Kenyan youth title in 2010 and, in her first international appearance, easily defeated her Ethiopian rival
Tsehynesh Tsenga to the
2000 metres steeplechase gold medal at the
2010 Summer Youth Olympics. She acted as
pacemaker in
IAAF Diamond League competition in 2013 and 2014, but showed her individual talent by winning the 2014
Abdijcross cross country meet. She paced the
Glasgow Diamond League 3000 m steeplechase which resulted in a North American record, two national records, and a world youth best. Nyambura was selected for the Kenyan
distance medley relay for the
2015 IAAF World Relays – her first senior national call-up. She anchored the team to the silver medals behind a world-record breaking American team. As part of the Kenyan team, she helped break the
African record and the
Commonwealth record with their time of 10:43.35 minutes. She had her first major individual victory at the
Doha leg of the
2015 IAAF Diamond League. Charged with pacing duties, she led up to 2,000 m, then continued the race to score a victory in a personal best of 9:21.51 minutes. ==Personal bests==