As Wellington's longest serving City Councillor for 30 years, she served as deputy Labour Leader, then Labour Leader for six years -leading the Labour team to a majority position on the Council.
Later she was the first female deputy mayor, chaired the Airport Authority for eight years and all New Zealand Airport Authorities for six.
She spearheaded the Declaration of Wellington as a Nuclear Weapon Free Zone; was appointed chair of Wellington's world class Civic Centre project taking its concept plan to unanimous Council agreement, giving Wellington a heart; and chaired the protection of Wellington's historic Town Belt - a six-year project culminating in legislative protection, the Wellington Town Belt Act 2016, and with 130 hectares added to it.
Ritchie served on a range of diverse Boards ranging from health, mental health, arts, museums, the natural environment, airports and councils.