I'm so sorry she has to go through this especially at such a young age. I don't have Crohn's, but I have Ulcerative Colitis which is very similar.
It took many months to narrow down what causes flare ups, and what to avoid when a flare up occurs. I can no longer eat peanut butter, nuts of any kind (esp. almonds), and have to eat salads only occasionally - those def. trigger flare ups. When a flare up does occur, I try to stick to chicken broth & jello. The GI dr. told me it was best to stay away from anything solid so my intestines and colon could rest. I have recently though found th