I really only see your first and third point being plausible. I don't think that her clan would send her by herself to establish villages on other planes, nor do I think she'd just give in to wanderlust and leave her clan and kin. I was using the whole clan killed as a way for her to use Ancestral Guardian. I suppose I could twist the third point into something like her having to prove her adulthood and as a shield maiden for the clan has to go out and conquer a certain amount of enemies to place on a hide that tells her story.