I'm sorry to hear about
your daughter. My 8 yo son suffered from constipation before he was diagnosed. The doctors never suggested he might have intestinal or flora problems. Instead they gave him a mild laxative and said eat more fibre; which probably made things worse. Following two rounds of antibiotics close together he began having D and blood. From what I know now he probably had a gut flora imbalance before but the antibiotic triggered his first full blown flare.