Yes I beleive IBS can be treated successfully with the an alkalizing protocol, some claim IBS is actually just a symptom of acidosis, correct the imbalance and the symptoms vanish!
You can help your friend a lot by first changing to a diet that eliinates all processed carbs, junk foods sugars processed foods bread pasta etc. to a diet closest to nature!
However this is not the forum to come to for help or positive imformation, but a debate forum often infested with medtrolls!