If indeed intent is important one should also question how actively pursue turning her good. I think we can all imagine such a relationship turning to a comfortable stalemate, the paladin in his hart wants to turn her to the good side, but any attempt at it is rebuked with a sly smile and "not today handsome" Should he actively pursue turning her good, and if it begins to show it doesn't work shouldn't he try differently/ give up and smite her anyway?