Irish Clov3r wrote:it's possible to hack almost anything as long as your smart enough to do it. Most likely she had someone around her maybe another friend figure her password out by knowing her pretty well would give them a certain list of what she might of chosen.
Correction, it's possible to hack anything as long as there's an exploit. You don't have to be smart to abuse an exploit (finding one is another matter entirely), you just have to be able to Google.
@OP: It's highly plausible that she somehow got a key-logger, or was susceptible to a phishing attack, or possible social engineering. It's highly doubt-able, however, that someone found a 0-day and just went after your friend.