I agree she doesn’t look very healthy, but you can have disordered eating and have a real problem with food and comments like this (undoubtedly she will read them) will only make her feel more crap and insecure and possibly gorge or binge. Has nobody here ever been in a complete rut with their weight? If you haven’t, well, you’re lucky!
So what, she moans about her weight, id say 95% of the worlds female population moan about their weight, some find the motivation to make changes and better choices, and others don’t, but that’s inevitably their problem and issue to deal with and it shouldn’t be judged like this. I have personal experience of people’s judgement of weight taking a very close loved one from me. A bit of kindness goes a long way...