Bhreathnach sought election for the first time in 1985, standing in the
local electoral area of
Blackrock at the
1985 Dublin County Council election. Bhreathnach was chairperson of the
Labour Party from 1990 until 1993. She was first elected to
Dublin County Council at the
1991 election. She introduced the University Act 1997, which made universities accountable for the public money they receive. After losing her Dáil seat in 1997, Bhreathnach was
nominated by the outgoing Taoiseach,
John Bruton, to the last days of the
20th Seanad. She sought a nomination from the Labour Party for the elections to the
21st Seanad, and there was some surprise when she was not one of the five candidates nominated by the party. She did not seek a nomination from the nominating bodies. Bhreathnach stood again for the Dáil at the
2002 general election, but did not regain her seat, and did not contest the
2007 general election. She was a member of
Dún Laoghaire–Rathdown County Council for the
Blackrock local electoral area from 2004 to 2014. == Personal life and death ==