Mostyn has regularly written for, and been quoted in, the media. She has advocated for prevention of domestic violence and for support of
Indigenous Australian women. when audience members asked whether prime minister
Scott Morrison's support for women "was genuine", following
marches in early 2021. Mostyn commented that recommendations by
Kate Jenkins,
Sex Discrimination Commissioner, following the national inquiry into workplace sexual harassment, could be implemented and accepted. as president of
Chief Executive Women, on economic recovery and
post-pandemic recovery, describing how Australia can make "the most of its available resources and talent" by investing in care, for
paid parental leave, childhood education and superannuation reform, as well as ensuring employees in the care industry, such as teachers, childcare workers and nurses, are receiving well-paid salaries, and respect within the workplace. She described how the pandemic had "left women exhausted and deepened their inequality, particularly in the workplace" and that much of Australia's "luck" had been due to the undervalued work of women. She has reported on corporate Australia and the gender diversity within the top 300 companies, with 5% of women CEOs in the S&P ASX200 companies. She has also commented on how quotas for gender equity in the workplace work, and how quotas within the AFL have led to improvements in the AFL and the
AFLW. She has commented that a large number of woman leaders "sends a message to everybody that women are equal and improves overall culture". She has stated that, when a significant proportion of women are on boards, issues such as
domestic violence policy and
sexual harassment complaints are brought to attention. She has also written in the
Sydney Morning Herald about women and the economy. She commented that the
election in 2022 would be a gendered issue, signing an open letter saying that widespread reform is needed to assist the return to the workplace for Australian women. == Honours ==