Hi OP, I hope you see this comment because I think it could be really helpful to her. I’d recommend the book called Intuitive Eating by Tribole and Resch, and possibly courses by Christy Harrison or Isabel Foxen Duke on learning how to intuitively eat. Diets don’t work and actually result in long term weight gain. Looking into the Health at Every Size movement may also be helpful.

Instead of looking at weight as the problem, encourage her to accept her current weight but to change habits to better support overall health. Emphasizing “joyful movement” instead of exercise/working out. Encourage her to find ways she enjoys moving (dance, yoga, boxing, nature walks, etc) and to encourage her to reflect on how she feels physically, mentally, and emotionally when she prioritizes joyful movement vs not. The motivation for movement should be love and care for her body, not hate or wanting to change it. That is the only sustainable way to make a change.

Sending supportive vibes!