In addition to Offspring Gardiner's television roles include the series Last Man Standing, mini-series Queen Kat, Carmel and St. Jude, as well as Wolf Creek, Redfern Now, Kath And Kim and the children's television series Fergus McPhail and Noah & Saskia.
On 21 February 2023 it was announced that Gardiner was named as part of the cast for Prime series Deadloch in the role of Cath York.
[4] On 9 July 2024 it was announced that Deadloch was renewed for a second series with Gardiner reprising the role of Cath York.
[6] In 2001 and 2002, Gardiner was a member of the original Australian cast of Mamma Mia!, playing the role of 'Ali'.
In 2017 and 2018, Gardiner played the role of 'Rosie' in the Australian tour of Mamma Mia!.