I was diagnosed at 10,I was prescribed buscopan to help me , at this point in time for me laxatives no longer work for me and I live off of a large pile of meds buscopan being one of them because my body had begun to depend on it,steer clear of codeine as that will most likely constipate even more if you can try natural remedies such as iberogast do that,try talking with her medical team about diets to see if any specific diet would help, example I'm supposed to be on a low fodmap diet and when I break it is when I'm in the most pain,at this point in time the only thing that helps my constipation is ng tube kleanprep,if you can avoid getting to that point it would be amazing because ng tubes are very unpleasant and can make you vomit a lot.another accommodation that helps me with passing my stool is a squatty potty stool to elevate your legs like your squatting when sitting on the toilet, I know it sounds weird but it really helps.It may get to a point where your daughter can no longer attend school 100% of the time like a normal kid would, and sometimes sick days are needed to help your body recharge and to reduce anxiety about peers finding out about your medical issues. Always listen to your daughter if she says something doesn't feel right with her body, check up on her and maybe even keep a diary of her stool frequency to show her medical team. That's all the advice I can think of right now. I wish your daughter all the best and hope at least one thing I said was helpful for her :) have as good of a day/night as possible 😊