>>3 I would have suggested a variable of this, but I find that it's much more difficult to do this unless you have someone living in your house who is going to purchase the right food for you. Considering she even had multiple jars of Nutella, I doubt her house is one which will support completely changing her diet style. Not all parents buy vegetables and bottled water or pretzels. (And by the way, most nuts are extremely fatty and shouldn't be used to substitute junk food unless eaten in very small doses.)
Plus, it's also not good for you to suddenly change the style of your diet; if you tend to eat a lot of chocolate, suddenly stopping eating chocolate will have a negative effect on your body, sometimes worse than the reverse. On the same note, if you usually drink water, suddenly drinking obscene amounts of soda will also negatively affect you. Ex- I used to eat a lot of chips, but I got worried when I was warned that they're not good for you, so I stopped. However, I immediately after started to get acne; if it was because of the chips, I would have gotten it before hand. Rather, it was because of the dietary change. My body was used to what I was eating and took a while to understand that I wasn't going to have any more of it. That's a stupid example, but the effects can be different, as well as better/worse, depending on the person. I frankly believe you should never spontaneously change the style of your diet without slowly working towards it. Changing the amount and time is healthier (in small doses) than doing such.
Again, any changes should be worked towards over time.
As for physical activities, remember that Ao isn't comfortable with her body. It's really, truly hard to exercise or take on a physical sport, especially one that has teams, when you can barely look at yourself. You feel ridiculous and can't appreciate any good that it might be doing. People often say that exercising will make you feel better because of what it releases, but sometimes your own emotional state can completely block that out, and you will only feel worse and worse if you try to do that before you're ready.
And even if you do exercise, you should never tell someone in this state that they can eat however much they want so long as they do; it's too difficult to judge, and it's very easy to get caught in that hole where you do ten jumping jacks and then eat eight bowls of cereal and lie to yourself, pretending that you exercised enough to get what you want. It just doesn't fit here.
What you're suggesting is like "chapter two" advice - it's for someone who has gotten past Ao's image problems and are now looking for the next step. We're not there yet.
Keep in mind that the method I gave in
>>2 is not the best weight loss method per se, nor is it a detailed explanation of a healthy lifestyle, but I believe it is the path that will best emotionally and physically help Ao in the long run.
You need to work yourself up a little bit at a time; sometimes you just can't handle doing it all. It's 50/50 when you go all out and completely change your lifestyle and habits - you'll either feel amazing or will completely destroy your self-esteem beyond where it is already, and I don't believe that risk should be taken just yet.