Wow, that's a tough one. On the one hand, you figure they might wanna hush it up. But conspiracies are ridiculously hard to pull off, and can you imagine the outrage if/when people found out she'd died earlier than had been reported?
If my visit to England this summer taught me anything, it was that people there seem to actually give a shit about the royal family. I had figured that was mostly the much older generation, but all that jubilee crap seemed like an actual big deal to a lot of folks.