Griffin was a full member and Labour Party Spokesperson for the Industry, Research and Energy (ITRE) Committee, a substitute member on the Transport and Tourism (TRAN) Committee and was assigned to the Delegation to the EU-Russia Parliamentary Cooperation Committee and the Delegation for Relations with the People's Republic of China. In October 2014, she was appointed the S&D Shadow Rapporteur for an Opinion on the ITRE Committee about greenhouse gas emission trading. She was also a member of the EU Intergroups (cross-party working groups) on Disability Rights, the Digital Agenda for Europe, Children's Rights and Well-being, LGBTI, SMEs, Tourism, Trade Union and Urban.
