From 2020 to 2021, she received a Masters in Public Administration (MPA) from the John F. Kennedy School of Government at Harvard University, where she was an Edward S. Mason Fellow.
In 1994, after Nigeria's poor showing at the Dakar regional meeting of the Fourth World Conference on Women, she co-founded Gender & Development Action (GADA).
At GADA she facilitated and managed programs in partnership with global organizations like USAID & UNIFEM to improve the development index for women in Nigeria.
Nkoyo’s interest in politics resulted in her appointment in 2008 as Nigeria’s ambassador to Ethiopia and Djibouti as well as the country’s Permanent Representative to the African Union and the Economic Commission for Africa.
While in office she served as a valued member of the Foreign Affairs Committee and specifically championed a resolution for the status of the Bakassi people abandoned for 10 years after an ICJ judgment that left them straddled between Nigeria and Cameroons as stateless citizens.