Keep her away from seeds: sesame, seeds in berries (raspberries, strawberries), and anything that’s highly acidic (hot sauce, coffee, alcohol).
Go to a Mexican grocery store and find a bark called cuachalalate. Throw a few pieces into about a 1.5 L of water (assuming it’ll reduce to about 1 L) and boil for 20 minutes until the liquid is DARK red (wine color). Store in fridge. Drink a few glasses a day within a few days tops. It’s highly anti-inflammatory but she needs to drink it daily for weeks if not a few months before she can notice a difference.
If she wants to use berries in her smoothies (this is a good way to get vegetables and fruits in her), blend the berries with water and strain the puree so you get rid of the seeds.
In fact, do this and pour the mixture into an ice cube tray so you can use them in smoothies later. It’s a lot of work, but it really helps.
Force her to go gluten free for a good 3-6 months. See if there’s a difference. Gluten free is HARD, but a worthwhile effort for people with her condition.
Dairy proteins and red meat will be hard on her gut. You mentioned poultry but why not fish? Shrimp/scallops? Easy source of protein, “easier” on the gut than other sources.
Fermented foods are good: kimchi, saurkraut, etc.
Ginger tea (find cheap bags on Amazon) after every meal to help with digestion, and even 1 TBSP of apple cider vinegar with each meal (before/mid/after…doesn’t matter) to help with digestion.
If she has a “leaky gut,” get her to take 1-2 TBSP of psyllium fiber (in a small amount of liquid so she can down it, but don’t dump it into a water bottle…you want the fiber to have “room” to absorb fluid in her gut) about 2 hrs after every meal.
A hot bath (not shower) for like 20 min should calm down her stomach. Also, for some people, laying in the sun for 15-20 min
Buy her a good enzyme to have with EVERY meal. Buy her a pill bottle so she doesn’t forget to take them, and learn to portion out a few tabs per meal per day, and dump that amount into each “day” slot in the pill container.
Tell her to make you a sandwich and give you a blowjob for the effort. Non-negotiable.