If she had been stupider, she might have figured out sooner that she was a good luck charm, which sounds counter-intuitive, but is true.
Let me explain to you the nature of good luck charms, which I think works best through example: rabbits' feet are not good luck charms. For one, a good luck charm is always a living thing, so if you have good luck underwear, forget them. You're only deluding yourself.
It takes the full-force, upfront power of a living thing to suck all of the bad luck out of a room, which is ultimately how a good luck charm works. I mean, think of that rabbit. He must have been one poor bastard to get his foot cut off like that.
Bad luck is very scientific, in that way. Something of a Murphy's Law version of the way darkness is the absence of light, good luck is, quite simply, the absence of bad luck. Band luck floats about in every crevasse of the world (and luckily for all of humankind, is very capricious about choosing where to land).