ter Sluis went to RSG t' Rijks to get her VWO high school diploma. Whilst she started playing on the PSA World Tour in 2014, she decided to study for a few more years. She studied Sportmarketing at the Johan Cruyff University, a hbo programme set up for athletes. In 2018 she got her degree and she went on to play on the tour full time.
ter Sluis started playing squash at the age of 8. Together with her brother she started to train and play junior tournaments. She loved playing squash and chose to only play squash. From there she played national and international events. Won many national junior titles and even got selected for the European and world championships.
In 2014, she started playing on the PSA world tour, previously known as WISPA. In that same year she got selected for the women's national team for the first time.
ter Sluis is currently sponsored by multiple companies, such as VitOrtho voedingssupplementen, BRESS breda, Houtrust Squash and Decathlon Nederland.
