Some of the posts in here are perhaps less sensitive than they could be... I grew up on alphabites and waffles for dinner because I struggled to deal with food textures and would gag and retch. I'm sure my parents were frustrated by it, in fact I know trying to get a nutritious balance of food in to me broke my mum. She'd try to hide foods, like steamed potatoes, with boiled, and I could pick them all out. Every night my family would have healthy, nutritious meals and I'd be sat there with a plate full of waffles and some bread. And like your daughter I'd have gone to hospital rather than eat anything different.
In my case by my late teens and early twenties I'd started to get over what ever it was causing my food issues and now I eat a fair variety of food, more than my wife who I'd consider a normal eater. Hopefully that will be the case for your daughter.
Sorry I don't have any remedy but I just felt I had to say something positive about it all because I know it's not easy and its a big fear for my little boy as he grows up. I hope you can find a resolution to your problem.