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This doesn’t sound like a peanut allergy to me, this sounds like a random toddler vomit incident. Maybe she ate too much, maybe something upset her stomach, maybe like you said it was the coughing. Peanut allergy wouldn’t occur to me

My mind wouldn't have even gone to allergic reaction. I would just assume it was some random virus. The fact that her lunch was undigested would indicate to me that there was something going on before the peanut intake.

Ok, I'm going to be the outlier here and say that a peanut allergy is possible. I've been allergic to peanuts since I was born, and this is very much how it presented in me as a young child. As an example, I have a very clear memory of buying a cookie at a bake sale during lunch in kindergarten (turned out to be a peanut butter cookie - who let me make this choice??) and vomiting in the library couple of hours later. (Why do we always remember stuff like this?!?). It happened a number of times, and the vomiting would start 1-3 hours after ingestion, and I never had hives or a rash. The reactions started getting worse as I got older, I experience full on anaphylaxis now.

All that being said, I always knew pretty much immediately when I had eaten a peanut, I would feel awful within a minute or two. If she seemed fine until the vomiting, I would agree that there's a good chance that this was just a toddler vomit thing. I've done the sitting outside the ER to test a food thing, it has always made me feel safer. Another option would be an allergist, a scratch test would give a reasonably accurate answer.

Vomiting can absolutely be a sign of a food allergy. So can coughing and itchy eyes. So it's definitely possible that she's allergic.

https://www.foodallergy.org/life-with-food-allergies/food-allergy-101/symptoms-of-an-allergic-reaction-to-food

I wouldn't wait until she's 2 to have more peanuts - the latest studies suggest introducing peanuts earlier, rather than later. I'd maybe wait until she's totally healthy and give her peanuts again - if she has another reaction, it's pretty safe to say it's to peanuts. BUT beware, our allergist said that each reaction to peanuts might be worse than the last, so if you were to do this, be prepared to run to the ER in case her reaction is much more immediate and much more severe.

Another option would be to see an allergist and have a skin test done to confirm the allergy. BUT skin tests (as well as blood tests) can be false positive, so you may not want to do that if you think there's a good chance she's NOT allergic.

Good luck. And we're living with peanut allergies, so I'm here if you need any advice.

Yes to vomiting and a possible peanut allergy. It took about half a day for my daughter to start vomiting from accidental exposure. She had no hives or rash. The amount ingested must have been minuscule, but she is allergic to peanuts so the reaction eventually presented itself. I think your plan of trying it again close to an ER is a good one. I wouldn’t delay until 2. Earlier exposure is supposed to be better. Good luck!