For a few months, I used her Facebook account to keep in touch with friends and family worldwide about the service, memorials, and the like. At the time, I had quit Facebook myself 3-4 years prior. This was very handy for all of this news dissemination, but then I used Facebook's "memorialize a person" feature to shut down the account for good. This changes the user's name to "Remembering ____ ____", disallows future login or comments on their posts, but leaves all the other content up. I also pulled an archive of everything (especially photos) before doing this.
It's honestly something I very rarely think about, probably mostly because I've disavowed Facebook for years now. But I appreciate that Facebook provided this concrete functionality. I still see her name pop up on other social networks on a regular basis (e.g. you and ____ both know ____).