Some brief history (and my theory of how the food allergies came to be) -
Looking back, and knowing what I do now, all these factors seemed to play into our problem.
During pregnancy, I was on antibiotics twice due to sinus infections.
DD was 10 days late, and after 36 hours of labor and babe not moving past 0 station (not dropping into my birth canal), I ended up with an unplanned c-section. I was also given numerous rounds of antibiotics during labor, because my temperature was "a little high".
I believe that the abx given to me during pregnancy were just too much for my immune system to handle, and I developed leaky gut (check out the Leaky Gut link for more info.) Probably my past history of abx and NSAID use, along with an unhealthy diet and alcohol use years prior probably made me a little predisposed to this problem. At this point, I think my body started reacting to foods that I was eating, but I didn't have symptoms strong enough for me to notice (or maybe I just thought they were pregnancy symptoms).
Because of the c-section, DD never traveled through the birth canal and picked up the initial bacteria that babies need to colonize their gut (GI tract). Also, because I received abx during labor, she started her days drinking abx-laced colostrum/milk, so that would have killed off any bacteria in her gut that she did manage to get. I believe these things left her gut exposed to damage (babies guts are naturally leaky, so that the breastmilk can pass through quickly), and since 70% of your immune system is located in your gut (Digestive Wellness), this meant that her immune system just couldn't handle what it should have.
(Being predisposed to gut damage, the later vaccines that DD was given overloaded her immune system, and she started reacting to the foods that were coming through my breastmilk.)