Need help with a friend?

my friend is really going through a rough time with her walk with god and the devil is really fighting her ive prayed for her and i still am praying for her and i tell her that i love her and that im here for her trying to encourage her and stuff but it doesn't seem to be helping much is there anything i can do to help her without pushing her away she is my very best friend and seeing her like this just rips me apart im really worried about her im so worried im not eating im sick and i cry a lot please help