Welcome...sorry to hear about your daughter. Everyone here has a different stories and advice, but we are all very encouraging and helpful, so please feel free to visit here as often as you like. There is probably no question that someone here won't have some advice for, or an experience to share what has worked for them. I hope you can find help for your daughter here.
Me.... I had UC (in and out of flares) for 8 years and my doctors tried a lot of different drugs, usually when the ones they prescribed didn't work or eventually stopped working. My lifesaver was Rowasa, a mesalamine enema. My symptoms disappeared within days of starting it, but I didn't really like the fact that I had to continue on it or my symptoms would come back. Actually, at one point, Rowasa's effectiveness decreased the longer I was on it. I point blank asked all my doctors about diet, since I started makng connections between the foods I would eat and my flare-ups, and they always said diet didn't affect my symptoms, just don't eat what I found to bother me, which at that time was dairy, onions, lettuce, bread. I have since realized on my own that I cannot tolerate yeast in any foods, even now. When I finally decided to make a conscious change to my diet after finding out, again on my own, that UC symptoms can have a fungal etiology, within 2 weeks I noticed a remarkable improvement, enough for me to continue watching what goes into my mouth, even today. Certain foods (sugar, yeast, grains) can feed fungi, or contain mycotoxins (corn/peanuts). And, when I told my last doctor about how I got well, he said it was a coincidence and passed me yet another prescription as I headed out the door. As I sit here typing, I am drug free, symptom free. I won't say that I am "cured", but I do suspect that if I choose to go back to my old way of eating, I will most likely incur my old UC symptoms again. For me, limiting yeast, processed sugar and my grain intake is key to staying well. It is a conscious daily effort. Nothing worthwhile comes easy in life :) That's not to say I never eat those foods, I am only human :), but I don't make them a regular part of my diet anymore. I am not the only one who has been helped with monitoring their diet. Maybe they will jump in here. As well, there are others who, for whatever reason, claim diet change has not helped them. I leave it with you. If you want to email me, I can be specific what I followed to get well again. Take care. I wish your daughter the very best.