Shadowheart with living Aylin and living parents has already passed two major tests of faith. That's plenty
You're right in what you say, but I think you're missing Zentu's point a bit. Light SH has proven herself worthy of Selûne, that much we've established. But has Selûne proven herself worthy of worship in SH eyes? For the relationship to work long-term the faith has to flow both ways. So when the dust has settled, does she start a new life as a Selûnite cleric? Or does she leave all matters of faith behind? And if she picks the second option, should she keep the powers Selûne has invested in her? Those are questions the game doesn't answer. And it should be addressed her epilogue in my opinion.
