OP, i wouldn't be surprised if you don't come back as it is very hard to hear no doubt that this is a problem that you are 100% enabling, and whilst all the posts are very harsh, you know that they are true. But i've been where your daughter is, and no matter how much she hates it if you step in now with major changes, she WILL thank you for it when she's an adult!
I've been overweight since i was about 7. I was very active, out after school every single day playing, never had pocket money but was allowed 10p now and then to go to the shop on the corner for a 10p mix of little sweets. My problem was way to big portions of food being served, which my parents were used to as they were both overweight too, and an unhealthy packed lunches. I'm sure they also allowed snacks that weren't very good for me either, i remember being a choc ice monster.
I'm now 27, due to OCD and depression and severe bullying in highschool i have been housebound almost completely since i was forced to drop out of school at 15. Food became an emotional crutch, and since i couldn't go out places or do any of my hobbies it became the one thing i could control, i could choose to eat ice cream, biscuits, cake, crisps etc if that was what i wanted, it was the one part of my life that wasn't restricted.
Now i've just stepped on the scales to find myself at 17 stone 3 pounds. I grew out of my size 16 jeans when i was 15 and put on 2 stone in the first 6 months after dropping out of school. I should probably be wearing size 20 jeans but it's too depressing to have to go up a size so i squeeze into size 18's that dig in and give me awful muffin tops and i have a very large stomach that overhangs my waistband.
I am completely out of control about my eating. I have been diagnosed with compulsive over eating, which is often in the form of binge eating. I hate how i look, i'm scared to death for my health, but i feel powerless ot change. Every time i try to diet, my mind starts racing "When did i last eat? How many hours do i have to wait until it's acceptable to eat again? If i eat half of tomorrows calories now, i'll just eat less tomorrow (NEVER happens) Am i hungry, or do i just want to eat because i enjoy it?
It is EXACTLY like when i get one of my obsessive thoughts with my OCD, and the compulsion is to go and eat, and the obsessing thoughts do not go away. There's no distracting myself, i can't watch a film, red a book, it just pushes its way right on in there. I've voluntarily had periods where i've deliberately made myself sick after eating in a desperate attempt to not gain further weight, let alone lose any.
I firmly believe if my parents had done something about my being overweight as a child, i wouldn't be the way i am now. Now i'm an adult, i have my own bank account, my own money, i can go out and buy whatever i want or buy it online to be delivered. it's completely self destructive. If my parents had refused to buy sweets, crisps, chocolate, ice cream etc ofc i would have had tantrums because i wanted it, but if they didn't give in i'd have had to accept it as i'd have had no money (they didn't do pocket money) to obtain junk food. If your daughter is spending all her pocket money on chocolate i honestly think you need to stop giving her pocket money, OR you keep posession of it, and buy her the things she wants with it, as long as it isn't food.
I have PCOS which they can't say for definite if it is a cause or effect of my being overweight, i have high cholesterol, my PCOS makes me insulin resistant so i need regular blood tests to check for pre diabetes or type 2 diabetes. I get massively out of breath just walking up the stairs, and quite frankly it's embarrassing if my dad tries to talk to me when i've just gone up the stairs as i'm gasping for breath and desperately trying to hide it. I have quite nice facial features but they are lost in the sheer amount of fat. My face is very round and i literally don't have a neck because it is naturally quite short and the fat around my neck is just in multiple chins, i genuinely look like a snowman, one round blob on top of my shoulders. I can't even lean my head back fully as i feel the fat round the back of my neck bunch up and its a very weird feeling. I look disgusting, feel disgusting, but am aware that if i lost weight (i need to lose at least 5 stone, probably 6) that i could actually be quite pretty. Instead i get abuse shouted at me in the street off complete strangers.
I'm begging you, don't do this to your child. Even if it makes her hate you temporarily, and she doesn't understand for another decade that it was for her own good, she will one day, and you could potentially give her years of life more, or a much better quality of it.