[3][4] After a brief period of working in Hong Kong for CNN, Brennan returned to the ABC in 2014 as a reporter for national radio current affairs programs AM, The World Today and PM.

[6][7] The invitation to appear on Insiders was issued after criticism the program received, including from Brennan, for having an all-white panel (consisting of Patricia Karvelas, David Crowe and Katharine Murphy) discuss the Black Lives Matter movement the week prior.

[9] Along with Dan Bourchier, Brennan co-hosted a special edition of Speaking Up on the ABC News channel about the Uluru Statement from the Heart and the Indigenous Voice to Parliament on 6 July 2022.

[14] Brennan was part of the first female Indigenous Four Corners reporting team when they investigated the issue of femicide experienced by First Nations women in Australia.

[16] In March 2022, she was highly critical of The Australian's coverage of the acquittal of Zachary Rolfe who was found not guilty of murdering Kumanjayi Walker.