She may be having motility issues which are very common after takedown. Are the BMs coming in rapid succession after meals, and if so, has she been given any anti-spasmodics to take before meals? Excessive peristalsis is a very common issue- I had it for a year after takedown. It's totally controllable with drugs like bentyl, levsin and donnatal taken 45 minutes before meals, although they could produce some side effects of feeling loopy.
Imodium is an anti-diarrheal. It does nothing to combat excessive peristalsis. Many people mistakenly believe it will resolve the peristalsis issue but all it does is thicken the bowel movements. The antispasmodics control the excessive peristalsis issue.