TBH I don't see it stated that it [twitter/internet] was an intended way to tell her. It comes with the times we are living, thanks to the internet things spread faster than fire. Also considering the fact that she was on vacation she might have been harder to reach (most people go on vacation to relax and get away). Anyway, that's not to say that this isn't unfortunate that she found out this way, just that it probably wasn't the way the information was meant to get to her.