Yep, growth hormones do a number on control as well as puberty hormones. Gosh, what an awful time you're having. My sympathies!
When I was her age I got into what my endo termed a vicious circle. She described it as "you eat more because you're hungry, and then you take more insulin because you're eating more. Taking more insulin makes you more hungry, so you eat more, so you take more insulin, and so on." They admitted me for a few days so they could oversee me "walking down" my food and insulin amounts.
It doesn't sound like she's actually eating a lot, but I do notice a lot of carb foods mentioned, if she's started gravitating towards them more than she used to it might be a sign of her feeling hungry and looking for an energy source.
Are they able to achieve any kind of control while she's in the hospital or are they just stabilising her enough to go home?