I am going through all the unanswered posts right now. Yes, this could be part of the desease and then again it could be a flu also. With Crohns it is hard sometimes to differentiate between both. Loss stools are a common thing with it and you really can't go anywhere right after you have eaten anything cause it runs right though you. I myself have collitis and am in agony sometimes. Started off with a nerves stomach as a child and advanced.
Has she been to a doctor or emergancy room yet? If not, I would not delay. Take her and get some help with the diagnosis.