Any advice on how I can help her?

Warning: this is about my friend having a miscarriage, don't read it if you're sensitive to this topic.
My best friend just had her second miscarriage in a year. How can I help her? What can I say that will be encouraging? What should I never ever say? I love her dearly and hate seeing her go through this. She blames herself. She says she won't even try to get pregnant again cause she can't handle this again. Any advice? Are there things I can say to help her? Are there things I can do? It just doesn't seem fair for me to have had my little guy recently and she has to suffer through this.