Your concern is so very nice. The others are right...there isn't much you can do, but to be open and available if she decides to take it any further. Otherwise, just treat her normally. In a strange way being treated abnormally or pushing food on an anorexic just pushes one further. The fact that she offered that she does or did suffer from anorexia is a positive. Admitting to oneself is very difficult...never mind others! Thanks for asking!