I wouldn't worry too much about it if her Instagram page shows her active and otherwise free of issue. I'm not a fan of people who feel inclined to manipulate others by making them worry unnecessarily by purposely giving broken pieces of information to see how they will react. She KNOWS she left you an ominous message when she only typed "hospital". If she has since moved on and is laughing it up on Instagram then she should explain herself. I don't believe in playing 20 questions to someone who should have the common sense and decency to explain themselves instead of putting a friend they supposedly care about through the ringer "guessing" what happen to them. That's selfish and immature.. If they're looking for attention, that's the wrong way to do it.