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.[5] She paced the Glasgow Diamond League 3000 m steeplechase which resulted in a North American record, two national records, and a world youth best.[6]
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.[7][8] 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.[9]