she should go get real medical assistance, not base her live on hearsay from people who do not know what they are talking about. an allergist can perform "scratch" tests and pretty much determine many major allergies. many things do not have test seriums. my mother had extreme reactions to strawberry, corn, crab, tomato. no problems with shrimp and lobster. she got severe migraines.

the tests are simple, and have been around since at least the end of ww2. i had my first scratch tests in 1947 when it was determined i was allergic to grass molds. we lived in illinois, which is a major wheat producer. i could not breathe through my nose till i moved to boston. in 1947, i think they had about 20 items for which to test. the last time i was tested in about 2005, they had hundreds of test items. there were at that time tests for only about 5 or 6 different tree pollens. i am allergic to one of them, but not one of those for which tests are available.