Diana is a member of the Romanian Parliament. She has previously served in the Ministry of Health, where she initiated and coordinated the Plan for Resuscitating the Blood Transfusion System and represented the Romanian Government at the Health Systems Performance Assessment (HSPA) and Social Protection Committee (SPC). She is a full member of the Health and Family Committee and European Affairs Committee in the Chamber of Deputies. As a member in the Parliamentary Assembly of the European Council (PACE), Diana is a member of the Monitoring and of the Social committees. In December 2020, Diana also joined UNITE.