His naivety became to signify fear, to mean good at heart or young inexperienced mind, trusting or having lived with only one perspective to a view.
Her naivety became to signify fear, to mean good at heart, which is more easy to say, that it was she who is naive, still. Unchanged as she remains, trusting, believing, faithful and true. That is what naive means, in a way. You do not change when you don’t have to or because you are afraid and believe truths of others instead of your own. When you are afraid the truth of your own, afraid because it may end up hurting you, because it is not the truth of the most of the world. Or maybe it is but they are afraid of it too.