How do I help my friend?

One of my best friends had been through alot in her life, she has lost her dad, all her grandparents, and has some anxiety problems, and is sometimes the 'odd' one in the crowd. Even when shes at her happiest something just seems wrong. Just recently she announced to me and her family she was atheist. She has come up with her own way of seeing the world.Since then she had been having many more anxiety attacks, crying attacks, and worries, and has been very depressed. Although she has every right to believe what she wants to believe but I just feel like I should be doing something to help her. I honsely think her life would be alot more plesent if she had God as support and present her anxiety, worries and depression to him rather then holding it in. I dont want to offend her or be to pushy I just want to help her. I can't stand seeing my best friend like this. What do I do?