Nash was elevated to cabinet upon her election as deputy leader of the National Party in February 2016, the first woman to hold the position.

As of 2011[update], their property of 600 acres (240 ha) was split into sections for wheat and canola, hay, and sheep grazing.

[1] Between 1999 and 2004, Nash worked as a staffer for National Party federal ministers Mark Vaile, Larry Anthony, and De-Anne Kelly.

In 2008, she was appointed Shadow Parliamentary Secretary for Water Resources and Conservation on the Opposition frontbench, but was asked to resign by Opposition Leader Malcolm Turnbull when she expressed her support for a motion by the Australian Greens to block the introduction of up-front tax breaks for carbon sinks.

[5] In February 2014 she came under scrutiny after it was revealed that her chief of staff, Alastair Furnival, held shares in a lobby group, which culminated with his resignation the same month.

[6] In March the Senate formally censured Nash after she missed a deadline to produce a letter Furnival apparently wrote, outlining how he would avoid conflicts of interest, given that his wife owned a lobbying company, Australian Public Affairs, which represented junk food clients.

[1] On 17 August 2017, Nash became embroiled in the Australian parliamentary eligibility crisis, when she informed the Senate that she had received advice that she was a British citizen.

[12] Her eligibility was considered by the High Court of Australia alongside numerous other cases of potential breaches of Section 44 of the Australian Constitution.