Do you think my friend should tell that she was raped?

She was raped by her abusive ex boyfriend when she was 13. He told her that if she told anyone, he'd kill her. And she believes him. I told her she should tell her family, but she said that her mom would freak out and call the police or his parents. Then he'd come for her. And he is capable of killing.
Update: Oh and she's 14 now.
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