Hi there
I'm sorry to hear of what your friend is going through.
My only suggestion is to continue being her friend. Listen if she wants to talk. Be ready with a hug if that is what she needs.
Perhaps point her in the direction of this board if she's looking for support from people who know what she is going through or if she has any questions.
Just continue being her friend. She is lucky to have someone like you who is there for her and is concerned for her.