when she said she had been training for this her whole life, Hurley asked her, "to blow stuff up ?"
and she said, "to protect you"
it was obviously to me from that answer that she didn't know anything about dynamite or explosives.
so its not so strange that she mishandled it and she blew herself up
also, Ben said, "I guess the island was through with her."
well, Ben is wrong. The reason she died is because its her job to protect the candidates, but blowing the plane up is not protecting them. It is in fact dangerous to them in some way we don't know yet. So the island killed her in order to protect the candidates