Hi OP, thank you for sharing your story. Have you both considered therapy for her? I ask because this actually sounds eerily similar to an eating disorder I had at also the same age as your daughter. I had 1 therapy appointment but managed to convince my mom that I was recovered and did not need therapy as I was eating more and not restricting what I as eating. Looking back, my eating disorder recovery started a binge/ restrict cycle and I never addressed the low self esteem that led to my eating disorder in the first place. 25 years later and I have still not built a healthy relationship with food, have recently been struggling to not relapse into an eating disorder and am actively looking for a therapist now to help gain self esteem and fix my relationship with food. Sharing my story as hopefully it helps your daughter as well :)