Dear Etienne, thank you for contacting us. Normally I would refer you to:
www.schoolbank.nl, where you can find almost every school in the country and, in most cases, a page where you can check in as a former student. Sadly however I cannot find an active community for the boarding school in question...
Perhaps you could leave a message on one of these two pages on our website:
https://www.bhic.nl/ontdekken/verhalen/meisjesinternaat-huize-nazareth-in-best
https://www.bhic.nl/ontdekken/verhalen/meisjesinternaat-laetitia-in-best
Already a number of former students has shared their memories there. The first page is about boarding school Nazareth, the second page about the adjacent boarding school Laetitia (same congregation and also part of the monastery). Also there is this forum, where you can leave a message:
https://www.bhic.nl/ontdekken/praat-mee/terms=1059
Kind regards,