The first signs of an allergic reaction can be a runny nose, a skin rash all over the body, or a tingly tongue. The symptoms can quickly become more serious - including signs of anaphylaxis (a sudden, potentially severe allergic reaction involving various systems in the body), such as difficulty breathing, swelling of the throat or other parts of the body, a rapid drop in blood pressure, and dizziness or unconsciousness. Other possible symptoms include hives, tightness of the throat, a hoarse voice, nausea, vomiting, abdominal pain, diarrhea, and lightheadedness.
The extreme would happen almost instantly. Other milder allergy or intolerances like a rash etc...would be to watch for up to 3 hours.
I think she is fine, IMHO. I would still follow the 3 day rule and then you know for sure she is good to go, sounds like she likes it.
We have it everyday (all natural ground up peanuts nothing else added) great protein for my DS.
A x
ps. yes it is dry, so loads of water with it or we sometimes put some no sugar added jam or honey on top. I find the all natural is much smoother, we get it ground smooth as possible.