Should I visit my sister, who has caused many problems for me and my family, or should I suffice with communicating with her through messages on special occasions?

If the sister has committed the aforementioned transgressions and disrespected her father, she must repent sincerely, increase her good deeds, and pray for her father. You should continue to advise her with wisdom and pray for her, while maintaining ties of kinship with her through visits and communication as much as possible. If she shows a desire for reconciliation, you should strive for it and avoid assuming the worst of her. As for revoking a conditional divorce, it is not possible according to the majority of scholars.