Is it permissible to interfere in a sister's affairs and prevent her from watching dubbed movies, driving a car, or working, even though her parents are present? And can she be prevented from using the computer to watch dubbed movies that contain inappropriate scenes, even if that goes against the parents' wishes?

Enjoining good and forbidding evil is one of the greatest rituals of Islam, and it is obligatory upon a Muslim according to their capacity, provided that it does not lead to a greater evil, and that the one forbidding the evil is capable of changing it without exposing themselves to great tribulation. A woman leaving her home, displaying herself immodestly, and watching lewd films are evils that cause great corruption. The father must fulfill his duty in protecting his children from sins, and you, the questioner, your duty towards your sister is to advise her gently, and you are not permitted to allow her to watch evils on your device. You must also advise your parents to take care of your sister's affair and guide her to the law of Allah, with a gentle and soft approach.