She is the party's spokesperson on Housing, Local Government, and Heritage. She previously served as a member of Dublin City Council from 2009 to 2020, representing Crumlin-Kimmage and the South West Inner City.[4]
Moynihan became involved in the Labour Party at a young age; she was the National Chair of Labour Youth from 2002 to 2004 and is involved in Labour Women.
In 2009, she was elected as a member of Dublin City Council. While a councillor, Moynihan had a motion passed to ensure free period products were available in all Dublin City Council buildings,[6] and secured 100,000 euros in funding for this project.[7] She was elected unopposed as Deputy Lord Mayor of Dublin in 2016 to Lord MayorBrendan Carr.[8]
As the party's spokesperson on housing, Moynihan has opposed co-living proposals put forward by the government, stating that it is "not suitable" and "even more unsuitable in the context of the Covid crisis".[11]
In January 2021, Moynihan tabled the Period Products (Free Provisions) Bill, which would provide for free tampons, sanitary pads and reusable products in all school bathrooms, educational institutions and public buildings in Ireland.[12]