Gill's research has focused on peer mentoring in criminal justice, coproduced and user-led community provision, and the ways that meaningful participation could advance social research, social justice practice and the regulation of criminal justice institutions. From 2020-2024 Gill worked as co-Investigator on a UK Research and Innovation (UKRI) funded project which aimed to reconceptualise prison regulation for safer societies. In October 2024 she began to lead her own UKRI Future Leaders Fellowship examining lived experience led criminal justice across the UK and Ireland.

Gill has published widely, presented at national and international conferences and supervised PhD students to successful completion. Gill regularly reviews manuscripts for book and journal publishers and is a member of the Cheshire and Merseyside Social Work Teaching Partnership (CMSWTP) 'research hub', where she plays an active role connecting social work practitioners with researchers to advance evidence-based practice. Gill has an interest in participatory and arts informed research and collaborates with artists and experts by experience in an effort to make research accessible.