I don't even know what to say to her :(

One of my best friends came to me today (we also work together) and shared with me that she is having some pretty serious marital problems. I was in their wedding...and it was only three months ago. She said that she just feels blank and really has no feeling or emotion towards her husband anymore. She wants to throw in the towel and just walk away. The thing keeping her there at this point is his son from a previous marriage whom she has grown incredibly close to and she takes on alot of his care during the times he is with them which is every other week. Her husband works alot. I suggested a ton of things to her and we talked for about an hour but I just feel so terrible for her and really don't know what to say. I guess in some way I feel like I have some sort of magic words that can make everything better for them and they can go on loving each other. But in reality I know that there is really nothing that is going to make things better other than the two of them wanting to put forth the effort to work on their marriage. I am just scared that she is not willing to do that at this point. She seems to have completely disconnected from him and its almost kind of scary the lack of emotion she has. I kind of think she is depressed but she has been to the dr before for this and has been on anxiety meds and I believe she still has them but not 100% sure she is taking them. Its a really difficult topic to discuss because in part I feel that she is just giving up way way too easy and needs to put forth some effort and I in a round about way said something to this affect, I just don't know if she really heard that or is willing to even try. I told her that the only thing she can control at this time is how she responds and how she reacts to his efforts to make things better. Ahhhh....I just wish I could make it all better!!