Yes, of course there is. I'm writing a GF DF cookbook and need recipes tested so if you'd like to try mine out I could message it to you. Would you be willing to offer feedback in return please?
Gluten issues are awful! But may I offer just a bit of my own experience? When I came off gluten and realized retrospectively just how much it had been hurting and disabling me (I have Celiac's), i became utterly militant about staying away from it. I had good reason in my mind, as even microscopic amounts bring on the pain and malaise and mind fog and exhaustion of my condition. I also, as a result of cumulative damage to the intestines, could no longer properly digest almost EXACTLY those same things that you said she can't tolerate (exchange shellfish for citrus and that's me). So to me, it sounds like she has probably suffered intestinal damage, which could very well indicate as severe a condition as I have, where every minute amount of gluten in one's diet will set back healing by a month or more as it causes new intestinal damage. Just because she hasn't been diagnosed as a celiac doesn't mean that she isn't - the testing methods all have a high rate of false negatives and docs are often reluctant even to test for it let alone diagnose it.
The good news is that with time, on a completely GF diet, other sensitivities (like to meat and greens) may dissipate or disappear completely as the intestine slowly heals itself. It gets easier. But quite frankly, after being "glutened" accidentally a couple of times and suffering the ill effects in contrast to feeling almost well because of a GF diet, I turned into a full on conspiracy theorist trying to imagine any possible way that any substance about to come into contact with me could have been (inadvertently or otherwise) contaminated with that evil gluten. Now I brown bag everything! I make most all of my food from scratch, and I almost never eat food prepared by others. I know I drove people crazy. I drove MYSELF crazy. It was really difficult and isolating at first, and still is quite a bit, but it's not a casual thing. It's not something where I can say, "Oh, just a speck won't hurt" because it does, physically, and even very minor amounts can set me back to not being able to digest other normal foods again, which is even worse. Yeah, I may sound crazy, and it's not fun to live like this. But its a heck of a lot better than being ill all the time!!! Sorry, I get passionate... but perhaps the MIL isn't as crazy as she seems right now?
Just a though from someone who's been there.
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