Disclaimer: I'm only halfway through the episode and I haven't read any of this thread yet, so I don't know if this has been said already, but....
Seana doesn't need help to lose weight. Seana is deeply traumatized and emotionally stunted. She likely has many mental health issues, besides just depression and anxiety. She doesn't need help to lose weight, she needs psychological support and maybe even a regular/daily support worker to help her adapt to adult life.
This episode was difficult for me, because she is so obviously in mental distress and nothing is being done to help her with that, just tons of pressure for her lose weight.