In July 2007, Morrison was appointed as the Chief Public Health Officer for Prince Edward Island (PEI).[2]
Previously, Morrison has served as the Chair of the Canadian Council of Chief Medical Officers of Health, the Co-Chair of the Opioid Action Plan for PEI, Co-Chair of the Ebola response for PEI, and Chair of the Provincial infection and prevention control Committee.[2] She has also served as a representative on behalf of the PEI on the Public Health Network Council of Canada, the national Special Advisory Committee in H1N1, and on the Epidemic of opioid overdoses committee.[2]
Morrison has spoken about different aspects of the COVID-19 pandemic in Prince Edward Island, including the COVID-19 vaccines, preparations for vaccine delivery and roll-out in Prince Edward Island, and public health practices, for multiple media outlets.[5][6][7][8][9][10] Morrison's leadership during the COVID-19 pandemic in Prince Edward Island has been recognized in various media outlets, and earned different forms of recognition, including being named The Guardian’s Newsmaker of the Year (2020) and having a calf named after her.[1][11]