In 2019, she represented Kenya in the Little Miss and Mr United World in Tenerife, Spain.
During her debut walk down the runway, her plastic bottle-themed outfit and monologue on the importance of Reducing, Reusing and Recycling (3R) plastics won her a Silver Award.
The King has also been guided on a 700m forest walk to a tree planting site, accompanied by Wangari Mathaai's daughter, Wanjira Mathaai and Kenyan marathon runner Eliud Kipchoge.
The British monarchs also visited the UN headquarters in Gigiri, Nairobi.
Earlier Wednesday morning, they toured the Kariokor Cemetery, where he presented medals to world war heroes.
King Charles III is in his first visit to a commonwealth nation since ascending to the throne last year. He is accompanied by Queen Camilla.