How can I help my friend in her religious confusion? (Christian)?

My friend and I have practically grew up together. Recently she's went through some things like her grandma's cancer is growing, her boyfriend of a year broke up with her, her job hours got cut, and she's gotten really depressed. We've went to the same baptist church for over three years now, and she says she has went into worshiping Satan. She's signed a contract to not ociate with Jesus ever again and everything! I've talked to her about God's love and wrath, but she's not afraid of hell. She's calling God names on face book. It's scary that my best friend is my enemy at the same time. She wears this odd necklace now and she says it symbolizes her satanism like how christians wear crosses.I thought about not being her friend anymore, but I feel like I'm not doing God's work. I feel as if I need to bring her back to God's side, but everything I do she laughs and idolizes Satan! This is scary to me. We're both still in high school and in cl she draws satanic things and asks me to look at them. What do I do when hell doesn't scare her!