Seems like a lot of things to avoid . . .
Shouldn't she have warned the airline ahead of time?
I'm not sure if these things are airborne. I have a shellfish allergy, which is pretty serious, and I know that nothing I eat can touch anything that has touched shellfish. But it's not airborne, otherwise, I would not be able to fly. Have you noticed how much shellfish is used in airline meals? Chefs for the industry seem to think a little shrimp or a bit of lobster or a crab cake adds a touch of class to an otherwise bland airline meal. In my case, these things add a touch of death.