Different strokes- I got a rash- some type of Rosacea - years ago from eating shellfish for several days in a row- took 3 weeks to show up- smart dermatologist figured it out.
Lena was tested for allergies to shellfish and it came back negative..but meanwhile if she eats scallops or clams, you can set your watch..she will be projectile vomiting in 5 hours..