Concerned Di

I am stressing about a friend. She is not a close friend.... but the 2nd wife of an old friend of ours. She is bulimic and a huge wine drinker. We had lunch with them on Sunday and she crashed pretty quickly (as in, keeled over). What the hell do I do, people? It's like this every time we see them.... and I feel terrible for her. And no, the husband doesn't do a thing.... it's just outrageous. A really really sad situation. Any advice from those of you who have therapy experience? What can I do to help?