Mwaysa was issued with a four year competition ban by the Anti-Doping Agency of Kenya due to a doping violations (set to expire in August 2027).

In 2013 she achieved her first medal over 800m whilst competing at the East Africa School Games in Lira, Uganda.

Mwaysa then won the 800m African Championship race in 2022 held at Saint Pierre, Mauritius.

[3][4] Competing at the World Athletics Championships in Eugene, Oregon in July, 2022 Mwaysa finished fifth in her heat won by Diribe Welteji and therefore did not progress to the semi-finals.

[5] Mwaysa was sprinted out of the qualifying positions as she finished fourth in her heat racing at the 2022 Commonwealth Games 800m by Keely Hodgkinson, Catriona Bisset and Jemma Reekie with all four athletes finishing under a second apart in Birmingham, England.