Kammala wannan jumla: A watan Maris na shekarar 2015, an nada Gallagher don cike gurbin da aka samu sakamakon ritayar Sanata Kate Lundy. An nada ta a ma'aikatar inuwa ta Bill Shorten daga baya a cikin shekarar, kuma an zabe ta a majalisar dattijai da kanta a zaben tarayya na 2016. Daga baya aka zabe ta Manajan Kasuwancin 'Yan adawa a Majalisar Dattawa. A watan Disambar 2017, a lokacin da
Gallagher ya koma Kotun Koli. Kotun ta yanke hukunci a watan Mayu na 2018 cewa an hana ta zama a majalisar dattijai saboda ta kasa yin watsi da 'yan asalin Burtaniya kafin a tsayar da ita a zaben 2016. Ta koma kujerarta ta baya a majalisar dattijai a zaben tarayya na 2019.