There's such a thing as gone too far, and Seiga passed that a while ago. It's absolutely her fault that she's seen as disingenuous, and even if she were to repent, she still has the kishin after her.
Plus, no way would I want to touch that. Who knows where she's been?
No I don't. You left your husband and children to study taoism. You love taoism and power unless saying this is also a part of your wicked agenda.
As far as I understood, it's more like her familly-in-law went against her passion for taoism, thus made her take a painful decision. If anything, they are the bad guys in this case.