J.S.
Hi Jeana,
I'm 41 and am still allergic to walnuts and pecans. As a child, I was allergic to just about everything, animals, pollens, eggs, milk, etc.. I received allergy shots which reduced and/or eliminated almost all of my allergy symptoms, except for pecans and walnuts. I also suffer from analphalaxis when I eat them. I strongly suggest she get allergy testing to find out what she's allergic to, and if allergy shots are an option, I would suggest she get them. It's possible she may outgrow them if she gets shots as a child. The best thing your baby can do is learn to be up front and ask whether something contains nuts or not before she tries it. When she gets older, she can test a food by taking a very small bite, the size of a crumb, and waiting for a full minute to see if she reacts. If there's no reaction, still proceed with caution with another small bite, and then when she's sure there's no reaction, eat the food. I get an itchy mouth and throat, and swollen lips immediately when I ingest them. I will immediately swish water around in my mouth and spit it out to get the remaining particles out of my mouth and use a toothpick to get them out of my teeth. Brushing the teeth is great, but not always practical. The toothpaste is somewhat cooling on the mouth and throat, as is mouthwash. Have her drink a lot of water to dilute the potentcy. Eating a mint will sometimes help sooth the irritating tingling in the throat too. Of course, if her allergies are so severe that she immediately goes into anaphalactic shock, head for the hospital. Another symptom of eating the nuts is a stomach ache. She may even suffer from diahrrea as the body tries to rid itself of the food.
Be sure to check labels, pesto, for instance, is made with nuts, and there are several baked goods that may contain nut flour, making it impossible to tell that the item has nuts. Don't always trust the waitstaff at a restaurant if you ask them to check a label, make sure you speak to the owner or chef. I once asked a waiter if some breakfast bread had nuts and was told it did not. Once I took a bite, I knew differently.
Unfortunately, most sweets, especially around the holidays, contain nuts and avoidance is the best solution.
Do a search on oral allergy syndrome, it may help explain what her body is doing when she eats these foods. I hope this helps!