Norovirus is going around at the moment so it sounds like it could be that. I hope she feels better soon x
Sometimes it takes around a week for the symptoms to show which is why they recommend to stay on each step for at least 7 days before moving on because of delayed reactions. Only way to know is give it a few days and try again x
Sounds more like a bug to me. If she still has an allergy at this point, it's more likely to be a mild, cumulative reaction (upset tummy/mucus poo, eczema, rash etc.) X