Career
Her personal best for the 3000 metres steeplechase is 9:13.85 minutes, set in 2015. 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 3000 metres steeplechase to 10:13.6 minutes.
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 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 2000 m, then continued the race to score a victory in a personal best of 9:21.51 minutes. 1500 metres – 4:10.0 minimum (2015)
3000 metres steeplechase – 9:13.85 minimum (2015)
2000 metres steeplechase – 6:02.16 minimum (2015) Arkansas
Distance medley relay – 10:43.35 (2015) – team of Selah Jepleting Busienei, Joy Nakhumicha Sakari, Sylivia Chematui Chesebe and Nyambura.