Hi TC,
after you introduced her to EFT as CHristine described, you can just tap on the things she is allergic to:
Even though I have a problem with peanuts, I know that I am a great kid
Even though my body has a problem with peanuts, and it might be an allergy, I know my mommy and daddy love me
Even though I am angry that I can't eat peanuts like my friends do, I am OK with this now
Even thoug I am nervous because my skin itches, I know that my friends thingk I am great
...you get the idea
It is sometimes advisable to use "problem with" instead of allergy,
because not every substance sensitivity is an allery in the clinical
sense.
Just tap on the substance itself, it doesn't matter if you know or just guess if there is a problem, since tapping causes no harm, and cover all the products you can think of.
A great way to start might be with the itching, because this relief will be easy to measure. Spread your arms out wide and ask her if it itches "thiiis much", or ...bring your hands together... "this much" then tap, using her words, and check in again. Just make sure you find some way to test the results before you expose her to the substance. Muscle testing might work, too.
Hope this helps
Please let us know how it goes
Love
Ingrid