In the 1990s, she worked for an extended period as a director with the World Health Organization in Brazzaville, Congo.

[4] Following the independence of Zimbabwe in 1980, Nhiwatiwa was one of only five women who became members of parliament for the ruling ZANU–PF party.

[5] In 1988, she left the government of Zimbabwe to become a senior Unicef official in Nairobi, Kenya.

She moved to Brazzaville in 1993 as director responsible for the World Health Organization's external relations for the Africa Region.

[5] After retiring from the United Nations in 2001, Nhiwatiwa became a charity worker, founding the Zerapath AIDS Orphanage in Harare.