Please help me help my best friend!

Ra

A little back story. My friend and I have been friends for about 8 years. We trust each other completely and have one of the best friendships imaginable. Just recently she found out through her mother-in-law that the father of her 3 children has been cheating on her with someone who she has sister tattoos with. It breaks my heart because after all this time I’m not just friends with her but love the whole family. Any suggestions on what I can do for her? I just want to make her feel special and show her she isn’t alone in this.