Best friend and divorce

Okay I'm not sure if this is the right group to ask this but im desperate. My best friend's husband asked for a divorce out of nowhere five days ago and moved out and I have no idea what to say. I dont know how to act or help her at all. I dont want her to shut down and not talk about anything but I dont want to push to much. Ive never had a friend this close to me go through this and I just dont know what to do or how to help her. Any advice?