She was co-opted as a member of South Dublin County Council in 2011 and continued as a councillor until her election as a TD in 2020, and worked as chief of staff of global operations for PayPal. She served as Leader of the Fine Gael group on South Dublin County Council and as Chair of the Land use, Planning and Transport SPC Strategic Policy Committee.
She is a member of the Governing Authority of University College Dublin (UCD), where she went to college and graduated with a Honours Degree in Economics and Sociology.[3] She also worked for a period of five years as an assistant to Frances Fitzgerald.[5]
In November 2019, she apologised for an incident in 2014, in which she delivered a letter to her constituents where she expressed "delight" over canceled plans for accommodation for Irish Travellers in Newcastle, South Dublin.[6]
In May 2022, Higgins was widely criticised on social media for her "months-long campaign" and work with Simon Coveney to rename An Post's Passport Express service as Post Passport, as it was not quick enough. Critics described her video announcing the change as "tone deaf" and asked whether there were not more important issues for elected representatives to deal with. As a result she was ratioed on Twitter.[10]
On 17 December 2022, Higgins seconded the uncontested nomination of Leo Varadkar as Taoiseach for his second term.[11]