In 2003, then-Liberal leader
John Brogden appointed her to
Shadow Cabinet in the Juvenile Justice and Women's portfolios. She later served as Shadow Minister for Climate Change and Environmental Sustainability. When her party won government at the
2011 election, she was removed from the frontbench by premier
Barry O'Farrell, allegedly for having alienated the
Shooters and Fishers Party by saying she would not allow hunting in
national parks. In May 2011, Cusack received wide political support for a strong critique of her government's decision to retrospectively alter a Solar Bonus Scheme, by cutting tariffs from 60 to 40 cents for customers who had signed up before November 2010 under the previous government.'''' Cusack was Chair of the Commonwealth Women Parliamentarians and represented Australia at the Women in Parliaments Global Forum in Amman 2016 and chaired a workshop on "Political Violence Against Women". At a hearing of the NSW Parliament's Standing Committee on Social Issues in March 2013, Cusack expressed feeling "excluded and often looked down upon by gay culture." She also accused the AIDS Council of NSW (ACON) and the gay community in general of "looking down on women and deliberately excluding them from efforts to combat AIDS." Cusack served as Parliamentary Secretary to Premier Mike Baird from 2015 until he retired in January 2017. Premier Gladys Berejikjlian who was elected unopposed as Baird's replacement, appointed Ms Cusack as Parliamentary Secretary for Education & the Hunter. Two months later in February 2017, she resigned for sending an email to Premier Gladys Berejiklian, criticising her cabinet appointments and her colleagues. In January 2018, she was re-appointed as a Parliamentary Secretary for Digital Inclusion as well as Parliamentary Secretary for Cost of Living, initiating programs such as the Cost of Living Officer. In November 2018, Cusack won preselection for the Liberal Party's Upper House northern province against Scot Macdonald, and was subsequently re-elected at the preceding 2019 NSW state election for an eight-year term ending in 2027. Cusack again lost her Parliamentary Secretary position when in November 2020 she crossed the floor on the controversial Local Land Services Amendment Bill 2020. Cusack advocates for children of prisoners, reforms to reduce the number of women in prison and assist their transition post release. Cusack hosts the Annual Women Keeping Women Out of Prison Breakfast at NSW Parliament, and is an Ambassador for "Dress for Success" (a charity that assists women leaving prison). In March 2022, Cusack announced she would resign from parliament over the federal government's handling of the
flooding disaster on Australia's east coast. On 19 May 2022, Cusack said that the earliest practical date for her resignation was the first week in August 2022. She resigned on 9 August and was replaced by
Aileen MacDonald. ==Personal life==