Earning her first national level cap at the elite level in 2019 with a debut against the Sunshine Coast Lightning in Round 5, O’Shannassy was rewarded for her work off-court. It was her third season with the GIANTS as a training partner, and she earned the call-up to full-time squad member the following year, something she retained for 2020 before unfortunately succumbing to illness prior to the disrupted 2020 season. O’Shannassy jumped ship to the NSW Swifts as a training partner for 2021 and earned an elevation to the main squad for 2022, and will be sure to put her hand up when the chance arises. 

O'Shannassy is a talented prospect with her quick footwork and long reach able to disrupt the attacking forays and collect tips and turnovers. The 188cm defender will be eager to leave a lasting impact on the competition when she takes the court, with her versatility and great vision putting her in a good position to not only learn and grow off teammates Sarah Klau and Maddy Turner, but also slot seamlessly into the backline. A smooth mover, O'Shannassy is one to watch in 2022.