Well first of all, as I'm learning now, your thyroid has a GREAT deal to do with enzyme production and digestion. The Master Gland. I think it may be a root cause for us. Which is not to say nutritional deficiencies didn't cause the thyroid to go out of whack (selenium, iodine for ex.) or mercury fillings as I just found a connection. There can be many layers to the "why" question. Allergies are not inherited, they are created. Something has to turn the gene on, the environment plays a larger role than what we inherit in this instance.
Vitamin A deficiency is so very common and can wreak havoc on proper functioning of immune system. Did she or DS get vaccines? I'm pretty convinced that the Hep B at birth has a lot to do with messing up intial laying down of infant gut flora. Coincidentally peanut allergies have risen the same time as Hep B shot has been more widespread.
I respectfully think that the vit. C could be an issue now if not the cause in the beginning... high vitamin C is very hard for a sensitive gut, I know this personally! And the C in your breastmilk definitely increases based on supplements. And the deficiency in bioflavonoids could be a factor, they are certainly well studied for aiding allergic response (quercitin for example). Natural sources of vitamin C at a smaller dosage (b/c its anywhere from 10-15x better absorbed than chemical form) might be better for everyday use.
Yes, there can be an intial adjustment period with digestive enzymes. See www.enzymestuff.com
. Generally one needs to start slowly, with maybe a half a capsule 1x day. I had significant issues with just myself starting enzymes.
Coconut oil is a huge problem for DS, the idea in the "pro coconut community" that it is rarely an allergen is not correct. I've since met many people with coconut issues.
Also it's possible what you are eating still contains an allergen for your babe, as frustrating as that sounds. My DS reacted to 25 different foods in allergy testing, lots of weird ones. He is doing well on a Rotation Diet that limits exposure but there are some things he simply cannot have at all.
I think you might just have to test the probiotics on your DD to see what works best with the general need for bifidobacterium in mind. Perhaps there was something else in the Solaray that was a problem, maltodextrin from corn? Did you try the dairy free Bifido Factor from Natren on her?