I think it’s great that you have posted this and were concerned enough to get advice here OP.
There are some really great suggestions and you’ve had a lot of supportive answers.
I was a chubby child and I think it’s because my mum thought food was love, she only got a wake up call when people started to comment on my weight.
There is a lot of sugar in your daughters diet (which you are aware of) it’s not just about weight but teeth as well, my friends daughter is probably underweight but eats a lot of sugar and drinks tons of fruit juice and has had to have fillings on her baby teeth, the dentist might be a useful ally in helping your daughter eat more healthily.
Instead of a weekly takeaway could you make “fake aways” together as a fun activity? I know you have a lot on your plate (sorry for the pun!) but it encourages learning about food and nutrition and some cooking experience, I imagine it’d save money too. There are a lot of great recipes online and quick and easy to make.
An idea I’ve seen mentioned on mumsnet a few times is to have a snack box. You put a weekly quota of snacks in the box and your daughter has complete control, if she eats them all at once she learns to pace herself. At the same time have healthy snacks available like raisins, rice cakes, low fat yogurt, cottage cheese, alpen bars etc… I know some people have unlimited fruit but it’s not great for teeth if you have too much.
The boxes just have the unhealthy things like chocolate, pancakes, crisps etc..
I noticed kids prefer roasted vegetables to boiled, if you use spray oil and roast in the oven you can roast peppers, onions, carrots - even broccoli!
Your daughter is used to eating a lot and her stomach will have stretched, if you restrict food or cut it down rapidly she’ll just be hungry and crave sugar and become obsessed with food. It’s better to replace what she’s eating with healthier options.
I noticed a pp asking if she could be thirsty? Being thirsty can often be confused with hunger. Also check the calories and sugar content of drinks - they can often be responsible for weight gain and tooth decay. Fruit juice can seem a healthy option but I wish more people were aware of the effect it has on teeth.
One last thing (sorry for bombarding you) can you do any fun exercise at home? Trampoline? Wii fit (if they still exist?) bike riding? Hula hooping? Skipping? etc…
You have loads of time to turn this around and you sound like a fab, but tired and busy mum.
I hope you find some of this useful and don’t see it as criticism, I just wanted to offer some advice and support because I wish my mum had done the same when I was an overweight child.