Are you a good friend?

Picture this scenario.

A friend of yours is in great pain, maybe because she lost something. She's suffering greatly. She doesn't enjoy living. At all. She spends all day crying and hating herself with all her heart. She is taking medication for her depression. It is not working. Your friend tells you she wants to die, tells you she will never get over her pain. Since you'd probably think she's just being pesimist or childish and you won't believe her as much as she pleads you to do so, magically, you have some way to confirm that what your friend says is true: her pain is everlasting, and will even grow ever stronger. You love her, but not as much as you love your other friends. She, on the other hand, loves you deeply and truly. You know she wants to die. But she's scared, because she believes she might go to hell if she commits suicide. You have some other way to know that what she says might be true. She wants help. Your help. Now, you have only one chance to say something to her, whatever, anything, and after you're done, you will never see her again.

What do you tell to her?