This is a very common tactic in people with ED (not saying she has one of course!) but when you eat everything out of a packet you know absolutely exactly the calories you’re consuming and there’s no margin for error, when I was unwell I could never eat something like a piece of toast because it’s difficult to measure the butter and I’d worry I was a gram or 2 out, I even worried about fruit because every piece is a different size so I could never be 100%, so I ate pure crap out of packets (just very little of it) because the calories were there in black and white and they felt safer, could explain her diet a little bitI don’t think she eats a lot at all. The thing with processed food and eating disorders is she can literally track every calorie really easily. Hence her love of mug shots etc