Coincidence?

Bear with me, this may be the dumbest question you’ve seen in a while...

A few weeks ago, our daughter came down with a cold. Started off with a little sniffle one morning while we were eating pancakes then turned into a full blown snot fest. The first day I thought maybe it could’ve been a reaction to the pancakes as it was her first time eating them; there’s an egg in the recipe I use. Once it lasted around a week I figured there’s no way. She’s been healthy since getting over it, until last night. We again had pancakes and she gets all snotty again. Last night was terrible, she’s all stuffed up and miserable. Could she actually be having some sort of reaction to the pancakes (flour, baking powder, sugar, salt, milk and eggs) causing this or is it just a freak coincidence? She doesn’t get blotchy, no breakouts and even though she’s stuffed up doesn’t have terribly labored breathing. She just becomes irritable and restless. I’m sure it’s just another touch of a cold but wonder if anyone else has experienced reactions in this nature?