My Daughter Has Been Having Bowel Movements That Are Just

My daughter has been having bowel movements that are just mucus and red blood. She is very bloated and has pain in her abdomen, excessive gas and stomach cramps. Now she is getting feelings like she has to use the restroom right away and it's just mucus and blood no stool. She has had a colonoscopy and they said nothing was wrong. She just had a 2nd colonoscopy and they said they think it may be Crohns. She has not had weight loss, and leans towards the constipated side. They are now requesting a CT and I am curious if they are on the right track. Thank you in advance.