[2] Prior to entering politics, O'Shea practiced as a doctor specialising in emergency medicine and mental health at the PA Hospital in Woolloongabba in addition to working with current & recovering heroin addicts across Brisbane's southside and further advocated & pursued continued and expanded access to harm-reduction services.
O'Shea grew up in public housing during her formative years, which she credits with allowing her to achieve a good education through the life-stability provided.
[4] At the 2024 election, O'Shea won the seat of South Brisbane from incumbent Greens member, Amy MacMahon.
O'Shea finished second on the primary vote, however after the distribution of preferences, she defeated MacMahon.
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