Re: Does this sound like a mild allergic reation?
It does sound like she may be have an oral allergy response to and oil or additive in the chips... sorry crisps.
At five your child is old enough to have an accurate skin allergy test. I would see about getting her on a list so that you can identify her allergies and get the proper medications to treat them. My allergist saw my son at the age of 2. He could tell my son was having allergic responses to food and environment, but he was too young to get a postive response from the scratch testing. We are waiting until he is five to get another round of allergy testing done. So we can avoid his triggers and get allergy shots if necessary.
Do not dismiss swelling tongue and throat as well as the cough. Those are the first signs of an anaphalaxis allergic response.
If we learn by our mistakes, I am working on one hell of an education.