It's typical for a WW to ditch old friends and make new ones, primarily b/c of her current lifestyle.
Although this may be painful for you to watch, these are consequences for decisions she has made. If you want to listen, then do it. I just don't think you should engage, as an attempt to get on her better side or buddy up with her. Don't try to rescue her. She has to deal with the mess she has caused.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!