She can ask her doctor, and she probably already has, since she seems to be following sound medical advice. If you're allergic to shellfish, you can't eat shellfish. It's very tragic but since she has never eaten lobster or crab she'll never know what she's missing.
Originally Posted by
JerryFF
If someone is allergic to shrimp, are they also guaranteed to be allergic to lobster and crab as well? My step-daughter brought out in hives after eating shrimp one time and refuses to eat lobster or crab as well now, although she has never tried them. Is there a safe way to find out? Does that seem correct?