Shauna won the Irish U-25 singles in 2019. In 2019, she won the triples bronze medal at the
Atlantic Bowls Championships and in 2020 she was selected for the
2020 World Outdoor Bowls Championship in Australia. She participated in the
women's triples and the
women's fours events. In the triples partnering
Sophie McIntyre and
Chloe Wilson, the team won a bronze medal after losing to Australia in the semi finals. O'Neill finished 2023 with a double success at the
IIBC Championships, winning the singles and pairs titles. In 2024 she won a silver medal at the
2024 European Bowls Championships in the pairs. O'Neill won her first title at the 2024
Irish National Bowls Championships, when winning the singles and subsequently won the singles at the 2025
British Championships. She then successfully retained her Irish singles title at the 2025 Nationals in Lurgan and also picked up a triples crown with Limavady BC. == Personal life ==