I posted what I did on the ulcerative colitis forum, I used MMS orally once a day but I did'nt have gastritis or any upper digestive problem nor would I do enemas with it though you say they help, I doubt they would with ulceration.
Iordorol seems the best thing in you wifes case though too much could be irritant, an alterative is to use lugols and reduce the iodine to iodide with vitamin C or use SSKI, but some iodine is needed.
Not forgetting selenium and magnesium and of course a very good simple diet with healthy fats. Fish oil and coconut oil are excellent for inflammatory bowel conditions.
Diets a big subject but I ate no red meat, no preserved food, no spices, no fried food , no sugar, no alcohol, nothing that could add to inflammation. I'm sure you get the idea