Overweight child

Hi Brooke- My daughter (age 12) is SERIOUSLY overweight. Yes, it makes me panic and I’ve done my own thought work on this, but today she tried on her school skirts and burst into tears when they didn’t fit. This is happening more and more, and I really have no idea what I’m supposed to do. Am I supposed to help her have better thoughts about it? I’m not even sure what they would be. (All I’ve come up with is “It’s not a big deal” and “You’re just growing, you’re supposed to grow” so that it will be less painful for her). Or am I supposed to let this serve as a wake-up call for her? In truth I don’t see her eating any more than other kids her age, though she’s a bit more inclined to laze about. I did get her thyroid checked but it was fine.