The best thing my lawyer told me when I was going through something similar was to keep a journal of every interaction, action, etc. with the father. The next time we took him to court for no child support, we had documentation that buried him.
There comes a point when listening for hours on end isn't doing either of you any good. It just allows her to *wallow* stay on dead center and do nothing but stay in a "victim-head." Susan's stuff is good. I would urge you to try it and be sure to tell your friend you will go with her to an attorney, etc. but you will not continue to listen to her say the same stuff over and over. AND, explain to her why.