I used this for my Crohn's a few years back, and while it was not pleasant, it didn't hurt any more than I already did and boy, did it do the job. I was so grateful ! I still think of it fondly, even if I don't want to remember it....
If your daughter is in pain and thinks this is helping her get rid of that, I'd guess you will find that she accepts it as "icky but very useful" !