@Syanalassa Why should the emperor know how strong she even is? Most of her more impressive achievements have been in disguise as the Ghost Doctor. He has no reason to assume she herself was the reason for the lightning either. Yes, obviously some or something at the manor caused that but there's one other thing here that's more important. He's an emperor. He doesn't expect any of his citizens to pick a fight with him because he's
the emperor. They'd be hunted down by the entire empire, and possibly allied areas normally for pulling something like that without at least the backing of another empire's leaders, one that could really put a whammy on them and any of their allied areas. Even if there's someone amazing enough in that family to cause the lightning, they have to be careful how they approach this situation. Even if someone's strong individually, they may not stand a chance against entire armies backed by the funding of imperial coffers.