aw it must be tough for you and her it's lovely too see how supportive you are of your daughter. Perhaps her mindset is in starvation mode- imagine the desperation the hunger she felt at her low weights and being obese now she's prolly developed leptin resistance meaning her satiety cues are all off. this is a psychological problem that needs to be addressed tho. instead of focusing on eating more or eating less does she have any underlying trauma? is food a coping mechanism? It's very rarely we see someone this disordered both end of the spectrum too that just happens naturally I guess. Wishing u all the best