She may not have the funds for an expensive defamation suit, she may not want to be attacked anymore by a lawyer who has no qualms about insinuating things for which he has no proof, she may not be litigious, she may want, now past her father’s admission of guilt, just to try to heal from finding out that her own father did such despicable crimes. I can think of many reasons but somewhat understand, from watching docs on the children of murderers, that it can be a long, hard process to ever come to grips with such a terrible thing, filled with mixed emotions of anger, guilt, sorrow. It may just be too much for her right now.