She was re-elected to Belfast City Council at the 2019 election.
Hargey was co-opted to the Northern Ireland Assembly in 2020, to replace Máirtín Ó Muilleoir.[2] She was appointed as Minister for Communities at the formation of the 6th Executive on 11 January 2020. On 15 June 2020, Carál Ní Chuilín replaced her as minister on a temporary basis, due to Hargey's ill health.[3]
On 8 May 2024, she was appointed as Minister for the Economy on a temporary basis, due to Conor Murphy standing down for medical reasons.[4] She affirmed the pledge of office on 9 May 2024.
^"Minister Ní Chuilín MLA", Department for Communities website, archived from the original on 30 November 2020, retrieved 30 November 2020, On 15th June 2020 Carál Ní Chuilín MLA was appointed as Minister for Communities as Deirdre Hargey MLA has temporarily stepped aside from the role for health reasons.