It's a more valuable talent than it may sound. She fucked a kingsguard into committing high treason and breaking his oath to the true "legal" king (Tommen). She also has willpower that the other women in this series (other than Brienne) haven't shown. She actually did something bout her problems other than just hopelessly whine and cry. Her trust is also difficult to win, and I'd bet it'll get even more difficult after Darkstar's actions. She isn't a Sansa clone.