Dame Dehra was first elected as a
Member of Parliament (MP) for
Londonderry, as
Dehra Chichester (as she was known prior to her second marriage in 1928), in the
1921 Northern Ireland general election. She stood down at the
1929 election just before her second marriage but was elected unopposed as
Dehra Parker in the 15 March 1933 by-election for the
South Londonderry constituency following the death of her son-in-law
James Lenox-Conyngham Chichester-Clark, and served until her resignation on 15 June 1960. Her grandson,
James Chichester-Clark, was elected unopposed at the subsequent by-election. He later served as the fifth
Prime Minister of Northern Ireland from 1969 to 1971. From her re-election in 1933 until her retirement in 1960, she faced opposition only once. During the 1949 Northern Ireland General Election, with anti-partition agitation a common theme across the region, she was opposed in South Londonderry by a Nationalist Party candidate, T.B. Agnew, whom she defeated. She was a
Parliamentary Secretary to the
Ministry of Education from 1 December 1937 to 15 March 1944. She was also Chair of the Northern Ireland General Health Services Board from 1948 to 1949. She served as Minister of Health and Local Government from 26 August 1949 to 13 March 1957 and became a member of the
Privy Council of Northern Ireland in 1949, which entitled her to the style
The Right Honourable. She was elevated to
Dame Commander of the Order of the British Empire in the 1949 Birthday honours "for public services", having previously been appointed as an OBE, and was advanced to be a
Dame Grand Cross of the Order of the British Empire (GBE) in 1957. Her promotion to the Cabinet at the age of 67 under
Sir Basil Brooke (later created The 1st
Viscount Brookeborough) was part of his so-called 'reforming' premiership; his
predecessor having been criticised for appointing elderly members to Cabinet. She was the first and only woman to serve in the Northern Ireland Cabinet. ==Extra-Parliamentary activities==