Mrs Garritsen is one of only a few people who are known to have died and has an article in the Dutch Wikipedia. In that article it is currently not known that she died. We know it in Wikidata courtesy of the article in the English Wikipedia.
Every Wikipedia do things their own way. By not having categories for people who died in a given year, there is no way to know about the recent deaths known in the Dutch Wikipedia. It is also not possible to indicate to the Dutch Wikipedians what people are known to be dead in other sources.
Mechanisms like this help to ensure that proper information is available for "living people". Arguably, maintaining categories with the people who died in a given year are a valuable instrument in an implementation of "BLP".