OP, I'm glad it was helpful.
I certainly wouldn't be saying to ignore this letter and I can't tell (nor can any other poster, despite the last idiotic post about 'neglect') whether your DD is overweight.
I certainly think the height is a factor and unlike many here, I think your opinion and instincts matter. Yes, some parents are blind to their DC weight, most are not. It doesn't sound like you are! Most of us know our children well.
My DC are all healthy, sporty, no weight issues - but as they have got to teen / preteen years, would opt for a carb-heavy, low fruit diet, especially the boys, if they could. The fruit that used to vanish when they were small, was left sitting there. So without any issues around weight, from a dietary perspective, I had to address it, with certain rules around eating fruit / veg / salad, and adapting our practices to incorporate this more easily. So they do eat cereal for breakfast, which they didn't as smaller children; I'm under no illusion a bowl of cereal is very nutritional or filling so they also have to have fruit / berries with it or some yogurt, wholemeal bread + banana etc. so overall, all good.
The utter nonsense spouted about some food choices here, like it's devil's food, is crazy. It's about balance, preference & overall lifestyle (my kids play sports 7 days a week, and ensuring they have sufficient carbs & protein is important).
And like every family, I have odd rules that maybe others don't eg I absolutely hate fizzy drinks & we never have them; I'm not a fan of crisps & will almost never buy them either. Obviously there's nothing inherently wrong with either in moderation but I just don't like them.