It does sound like an elimination diet would be helpful, at least in sourcing the cause of the vomiting and the rash. You can have non-IgG immune reactions to food that wouldn't show up on a typical allergy test; that doesn't mean she isn't having a reaction.
I would cut out the major allergenic foods for 4-6 weeks, then introduce them one by one, slowly. Cut out wheat (preferably all grains), dairy, corn, soy, nuts, sugar and eggs. You can look up paleo menus and recipes for ideas on what to cook. When you reintroduce, be careful to intro just one food at a time for about 5 days in case there is a delayed reaction. Or, if she's doing well, don't reintroduce at all! Paleo/ancestral diets are wonderful for autoimmune and digestive disturbances.
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Living and loving in ATX with DH (of 7 years) and DS (3.5)