Hi laura, well it sounds like a few problems could be happening as to why your daughter wont eat. As anybody thought about that she might have an ulcer or hernia which can restrict what you can eat. You might have to look into having a endoscope down to check the throat and the stomach as to no other irritants that could be causing her to not eat properly. If you want to talk more just Email me. As a Chef i have worked around feeding picky kids and Special diets Gluten free, dairy free, Sugar free. You might be best to get checked for food  intolerances i have many myself and the dietician might be able to point you in the right direction to better eating. With your daughter worrying about food could be causing a ulcer and it does happen at any age. It is something you really need to get checked now. Is she back at school yet after her sickness. You know that getting the other that she has does come also from what foods get eaten and the reaction on the body. I f you can improve her eating less chance of sickness etc as the body is getting all the nutrients it needs. I will get out some of my recipes for you that might help in disguising food and it gets the kids eating. Email me. 

GOOD LUCK

BETTER EATING

LUV JAYNE