cookability

A friend of mine is in the middle of a long process of being diagnosed with Something (is it pcos? is it mcas? is it eds? is it pots? is it me/cfs? is it neurological? is it gastrointestinal? is it all of the above? will they ever stop doing tests and start suggesting treatments? you know the kind of thing) and as a result has been put on a very restricted diet, by which I mean separate specialists have put her on:

-low fodmap
-low histamine
-low fat
-low acid
-dairy-free

We are trying to throw together something resembling an American Thanksgiving meal for her that we can all eat together. Does anyone have suggestions?

-I found a roast chicken with popcorn stuffing recipe that will work if we leave out the onion and celery and go easy on the oils
-We'll do a fruit-she-is-allowed-to-eat salad
-We can do cooked carrots
-I'm going to try to do a simple savory raspberry sauce for the chicken

Anybody have any other ideas or suggestions? (I'd especially love ideas for something like a traditional American holiday dessert that has no dairy, nuts, grains, or sweeteners...)