I checked Facebook's "death policy"
here and you're right. It's possible she could have designated a legacy contact, but I bet most people don't know about that. If she did know, I'm guessing her legacy contact is dead. LE probably realized that a lot of people around the world were doing their own sleuthing, here and on other sites. A lot of information was being culled from her FB page, so it's reasonable that LE shut down her friends list. I have no explanation for why they haven't done it to the others. Again, I agree it's odd.