I hope you don't mind me saying this, but I have some friends that are working on revolutionary new methods of treating cancer... mainly in children. While most people think that "cancer" is just one issue, it's really a massive list of types and severity, each with its own unique properties, complications, and methods of treatment. So there are a lot of doctors out there doing some amazing new things to bring more effective, less invasive, SAFER, more powerful treatment into the field. It really is some mind blowing stuff, and it's even begun operations in select areas already. They keep saying "We're looking to put ourselves out of business as soon as possible"... these guys don't care about the money. They care about the people.
So while it may be a while before we see a dragnet "cure for cancer", it shouldn't take too much longer before particular kinds are able to be treated or even eradicated. So keep your head up and know that your daughter is helping pave the way for breakthrough science which will save countless lives and endless heartache in the future.
You've got this. Your daughter is in good hands. And she obviously has a very loving family. You're doing it all right and the whole world is better because of it. Keep being awesome and thank you for trusting us all with this information. I may not always be here, but if you're interested, send me a PM and maybe we can talk on FB or wherever else if you need someone to talk to.