[4] Cook is a Labor member of the South Australian House of Assembly, representing Hurtle Vale since the 2018 state election.

She previously represented Fisher after winning the 2014 by-election,[1][5] vacated by the death of independent member Bob Such.

[4] Soon after Cook and her partner, Neil Davis, founded the Sammy D Foundation, which runs school programs to spread an anti-violence message and provide positive role models to disadvantaged youth.

[8] Cook successfully contested the 2018 general election (when the new boundaries came into effect) in Hurtle Vale, becoming its first representative.

[2] Following Labor's victory at the 2022 election, Cook was appointed as Minister for Human Services in the Malinauskas ministry.