The blood tests for food allergies are very accurate normally but may occasionally not detect allergy to a food when it is present. The history is a good way of diagnosing a food allergy and here you have given a very clear story of cause and effect. It does appear that your little granddaughter is allergic to milk and soya.It would be best for her to be seen and treated by a paediatrician with an interest in paediatric allergy.
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