My friend needs help, What should I do? Options

[Ilaem]

Okay, so my BEST friend ever has a eeer, problem. One of her family members are sexually abusive and she made me promise not to tell. She wants to live like a normal person and stuff. I suggested that she tell someone or i would. She threatened to kill herself if i told. And i wouldn't doubt her. Especially right now. She has been reall depressed lately and she has started to cut again. I know that i should tell someone because it has become real serious. PLEASE, help.

[Comptine]

what if the attacker does it again? and again? just because he wasn't brought to justice. not getting caught makes a person even more daring. and even if she makes it through it intact, doesn't mean she's alright. there's the mental scarring. i was molested as kid and now i regret not getting the bastard because he still owns several afterschool places packed full of little kids.

and it someone from the girl's family. someone she will most likely see again. it could even be someone inside the house. how is she suppose to deal with that alone?

although, Ilaem, there is one thing that could go really badly if you tell. Sometimes families do not want to admit to sexual abuse so they might dismiss your allegation and end up hurting you friend.