Milo, I really feel for you. As a recovered anorexic, I can completely understand what your daughter is going through. And now, having come out on the other side, I can also understand what you and your family are going through.
Anorexia was hell for me. I hated myself, saw fat in the mirror even when I was several stone underweight, and completely could not understand and resented people trying to tell me I needed to gain weight. There was absolutely not enough support out there for me.
Now, in hindsight, I can see the flip side. My family went through hell with me. My parents barely slept for two years. My older sister, I now know, cried herself to sleep most nights and gave up huge chunks of her (mid-twenties, should be going out on the rip with mates) life to try and talk to me, to watch me and attempt to reach out to me . My baby sister (aged 16 at the time)grew up far too fast, and fell into a role of mothering me - begging me to eat, looking after me on nights out when I got completely hammered after a glass of wine due to not eating, and generally taking care of me. I robbed her of a part of her youth, and I will never forgive myself for that. Again, there was no support out there for my family, none at all.
Anorexia is a serious mental illness, and there should certainly be support available for sufferers and their families.
Please PM if you need any advice, support etc. You will need strength and support to get you and your daughter through this, but it can be done - as me and my healthy 11 stone body are a testament to.
My apologies for the hijack - I guess what I was trying to convey was, yes, it will be difficult, but you and your daughter can get through this, and hopefully you will both come out on the other side, all the stronger for it. It is shameful that there is not enough RL support for you, but I promise, there is much support on here.