I'm not a doctor either, but I take omeprazole (Prilosec). The PPI action treats acid reflux in the stomach. What does this have to do with IBS, which is generally lower intestine?!?
Please take her to the doctor to adjust dosage of medication, don't mess with it yourself. Besides, wouldn't she be more willing to give up the pills if that advice came from her doctor?
5'0" female, 43 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Current weight: skinny-fat 106 lbs. Resetting with the 21-day challenge.
MY PRIMAL: I (try to) follow by-the-book primal as advocated by Mark Sisson, except for whey powder and a bit of cream. I aim for 80-90 g carb/day and advocate a two-month strict adjustment for newbies. But everybody is different and other need to tweak Primal to their own needs.