I don't know what she was thinking either, though it does seems highly suspect to me that her public claims about being descended from witches followed the publication of her book, "The Power of Halloween." It's true that actors are often eccentric, but like dessert, a little goes a long way.
That said, I agree with MB that her DS work is a treat. Laura is beautiful and mysterious, and there's a sexual intensity to the way she regards a blazing fire, or even a lit match!