Standard Liège Mourmans made her league debut against
Anderlecht on 6 October 2012. She scored her first league goal against
PEC Zwolle on 6 September 2013, scoring in the 78th minute.
PSV Mourmans made her league debut against PEC Zwolle on 21 August 2015. On 18 April 2017, she extended her contract. She left PSV in 2018. Due to a back injury, Mourmans' contract was not extended and she signed with Ajax, who helped her rehabilitate.
Ajax Mourmans made her league debut against PSV on 8 February 2019. She scored her first league goal against
Twente on 3 May 2019, scoring in the 65th minute.
ADO Den Haag On 5 July 2019, Mourmans was announced at ADO Den Haag. She made her league debut against PEC Zwolle on 23 August 2019.
Beerse Boys On 20 June 2020, Mourmans was announced at Beerse Boys. ==International career==