Hello... Sir I understand your situation and concern towards your wife situation... I think you should know that there are people who might be allergic to egg white... In such persons it will result in allergic response in your wife's case stomach issues...if she has allergy for egg white that can be tested by skin prick test done in allergic clinics present in certain centres. Apart from this it might be also gastric ulcers which might have been there and its presenting symptoms irrespective of the food items she consume....So kindly enquire her regarding gastritis symptoms... Kindly consult a nearest physician for queries..