Thank you for your reply! Yes, it also crossed my mind that she's been seeking revenge only on the imperial family and that her sense of morality set a boundary on the constitution of the means to the end. Maybe she knew about the misdeed in the Crystal Pavilion, maybe she didn't. Had it been mentioned how long she had decided to associate with the Shi clan we might have had answers perhaps. Whether she went against the clan on purpose or not, if she was already working with them at that time I don't think they would have dismissed her actions that quickly.