During Cupper's first year in office, she successfully lobbied the Andrews Government to return the privately operated Mildura Base Hospital to public management.
On 4 December 2020, Cupper entered into a coalition agreement with Fiona Patten, leader of the Reason Party.
[2] The coalition agreement granted Reason a second representative in the Victorian Parliament, with Cupper being appointed Deputy Leader while retaining her status as an independent member of the Legislative Assembly.
[5] In November 2024, Cupper was re-elected to Mildura Rural City Council and elected Deputy Mayor.
[6] Prior to her entry to the state Parliament, Cupper worked as a social worker and solicitor.