My first response:
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I would get her tested for food allergies/sensitivities, and focus on healing her gut. Food allergy testing is both the IgE skin scratch test as well as the IgG blood testing (can be done without a blood draw - just finger pricking). As for the gut, after prolonged antibiotic use, some may need to have anti-candidals (such as prescription Nystatin) for yeast overgrowth in the gut, and a diet low in sugar and refined carbs as well as having probiotics and prebiotics.
If she has not been checked for nutritional deficiencies (iron, vitamin D, etc.) I'd consider that as well.
Sometimes we are better off seeing an MD who also specialized in Integrative or Functional medicine.
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Check to make sure that included in her IgE testing (needles in the back) they did the foods and spices. Also, that testing does not include the IgG food sensitivity testing which is done via blood.
This post: http://itsnotmental.blogspot.com/2011/03/gut-brain-and-ba... talks about how many people address the issue of healing the gut.