Glad she's alive - I don't really think she has that much of a direct role in the story from this point on, but for Ben to have murdered her is too dastardly. Ben needs to maintain a good/evil tension.
Well Penny isn't a child of the island like Alex. It was Alex's destiny to die, which was only delayed.
Hmm, hadn't thought of that - is everyone who is born on the island doomed to a violent end?