Username, I happened to catch your post and wanted to tell you that without knowing what you would actually do or say with the tough love approach, it's hard for me to give you feedback. So if you can be more specific, that would help.
The best thing that could happen would be if she calls you on your birthday and either you don't respond because "you're out having fun," or you do speak with her and let her know you're doing just fine. She would find that puzzling, wouldn't she?
I see the confusion. I also can tell that her therapist is helping her out of your marriage, something that happens far too often. That's why I wrote a section on how to choose a good therapist. I wish more people would read that before getting help.
Anyway, if you can be more specific about your tough love intentions, maybe I can offer my feedback. And, you're welcome, by the way. Thanks for your feedback. Michele