Have you tried some of the ground turkey recipes in the index? They are great and I have served them to people without telling them that they aren't eating beef, in a bolognese or a chili it really is hard to tell the difference.
What are your other kids' favourites, are there safe versions that you can make that they all can eat? I know that Shell's Turkey Meatloaf is very popular (check the recipe index)
I am one of six kids and when I go home for the weekend (i am 28, the youngest is 11) my Mom tries to make something that I can eat that the others will eat..she makes chicken and turkey stir fries, fajitas (i avoid the sourcream) roast turkey or roast chicken, pasta with a tomato sauce and chicken or ground turkey.
BUT if they are having something I can't eat (like beef stir fry which they all love) I just get a separate pan and cook some of the veggies that they are using for a veggie stirfry for me.
I agree that you need to just cook one meal, but it would be awful if your other kids take their boredom with menu choices out on your 11 year old.
I also full empathise with the label reading, I was diagnosed last August and my first few shopping trips after that took ages but I am used to brands and things now so I have a good idea what I can and can't have and I don't need to look at so many labels. You will get used to this and so will your family, promise.