Olyslagers competed in the women's high jump at the 2017 World Championships in Athletics.[7] Olyslagers also competed in the women's high jump at the 2018 Commonwealth Games, where she achieved a personal best jump of 1.91m and won the bronze medal.[8] On 20 June 2019, Olyslagers jumped a personal best of 1.96m at Mestský Stadion, Ostrava, Czech Republic.[9] Achieving a new personal best of 1.98 m in Sinn, Germany, on 29 August 2020,[10] she rose to second place in the all-time list of Australian women high jumpers.[11][12]
Olyslagers set Australian and Oceanian records with a personal best 2.00 m jump on 18 April 2021.[13][14] She improved her personal best to 2.01 in Stockholm on 4 July 2021 and to 2.02 at the Tokyo Olympics on 7 August 2021, winning silver.[15]
Olyslagers is of maternal Croatian ancestry, hailing from the island of Korčula.[16][17] Olyslagers had always been tall for her age, and says that she was not good at sports in her early years due to a lack of coordination. After she was introduced to athletics at school at age of seven and won the majority of the events from shotput to 200m, her parents got her involved with Little Athletics.[18]
Olyslagers is a devout evangelical Christian, and is a member of a Pentecostal denomination that she prefers not to name.[20] She became a Christian while attending a youth camp at the age of 16, and has regularly pointed to her beliefs as a source of inspiration.[21][22][23][24][25][26]
Olyslagers runs Everlasting Crowns, a ministry dedicated to encouraging and teaching athletes.[27][21]
She married Rhys Olyslagers in April 2022,[28] and since then has competed as Nicola Olyslagers.[29]