sounds tough I was a bit the same, although not to the extreme of your DD. I was sick after eating a couple of prawns when I was about 7 (I doubt it was food poisoning or anything sinister) and since then I just can't bring myself to eat them.
Hopefully with time and a bit of convincing she will be able to get over it, might just be something she needs to get her head around and realise that every dinner isn't going to make her sick. Will she help you prepare it? Maybe talk through food safety stuff with her and show her that you are doing everything you can to ensure you prepare healthy, safe meals for her.