What is more worrying really is the fact that this loss and gain took place in the space of just two years. So either she was taught very little about self management of her weight while at camp, and just restricted in her intake while she was there, or she hasn't been given access to proper support to maintain, which is, after all, the real battle.
Unfortunately, this is a growing epidemic. The NHS do not have the resources to stand over someone for 24 hours a day and push them into weight loss, and everyone has trials in their lives outside of their weight that they have to deal with. Even with support, at some point, we have to take responsibility for ourselves and acknowledge that we do this to ourselves and we are the ones with the power to keep control over it. We can be given the tools to do that, but once we have them, we need to be able to use them unsupervised or we will end up just back where we started.
I feel for her, and I know how easy it is to fall back into old ways, but in the timescale we are talking about it is unlikely that any effort at all was made to maintain once she came home. They can't have taught her nothing in the time she was there, surely?