I was going over the faq's & saw this:
28. If my pet tests reactive to hen’s eggs, will he likely react to chicken?
Presumably he will also react to chicken.
So, Turbo is reactive to chicken, but he's not reactive to eggs. Why not? What came 1st, the chicken or the egg...

here's the answer:
29. Fewer dogs showed food reactivity to soy (25%) and very few to egg (3%).
The 'hack'? Mine do that once in awhile. It can be allergies or something got stuck in their throat...if it's something she does often, then maybe taking a vid of it & showing the vet?