 After unsuccessfully attempting to appeal her suspension, her suspension was increased to two weeks, with the suspension ultimately causing her to miss out on competing in the Bulldogs' Grand Final victory.On 23 March 2018, Brennan made a gender discrimination complaint against the AFL to the Australian Human Rights Commission over the two-match suspension which ultimately prevented her from playing in the Grand Final.Her claim asserted that her suspension contravened Australia's Sex Discrimination Act 1984, as male AFL players would have only received fines rather than suspensions had they been found guilty of the same offence which she had been suspended for; as a result, women were being punished more harshly than men for the same offence.