Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 2 years ago

You must do what ever you can to help your friend and protect her from falling in dangerous sinful acts. You must be completely sure that she is doing or going to do that sinful act. You can inform one of her family members who has more influence on her but not every one if you think that that member of her family can help saving her from sinful acts.