Olislagers started her career with her hometown club BVC Bloemendaal at the age of eight. She then played for RKVV DSS,
Telstar and CTO Amsterdam in her youth career. In April 2018, Olislagers joined
Eredivisie club
ADO Den Haag. She made her debut on 7 September 2018 in a 2–0 league defeat against
Excelsior. Olislagers scored her first league goals, a hattrick, against
Achilles '29 on 12 October 2018. On 13 June 2019, she extended her contract with the club for one more season. In April 2020, Olislagers moved to
Twente. She made her league debut against
Ajax on 6 September 2020. She scored her first league goal against ADO Den Haag on 23 April 2021, scoring in the 80th minute. On 3 May 2022, she extended her contract along with
Daphne van Domselaar and
Fenna Kalma. On 1 July 2024, Olislagers joined
Women's Super League club
Brighton & Hove Albion. ==International career==