What are the limits of my intervention with my older sister to prevent her from watching bad movies, going to the markets, and obtaining a driver's license, given that our parents and older brothers are present?

Exhort the sister to repent from watching TV series that promote moral decay, and guide her to adhere to Islamic guidelines in her outings, dress, and speech with wisdom and good counsel, while not enabling her to watch what is impermissible on her personal device. Also, the parents and siblings must be alerted to help you in guiding her.