IBS is different from IBD. IBD stands for inflammatory bowel disease and the 2 major types are Crohn’s and ulcerative colitis. IBS is irritable bowel syndrome. So I’m not sure if cannabis can help with IBS.

You could probably find some edibles, capsules or tinctures/creams that might help. Could also try vapourizing if she doesnt want to smoke as it is much less damage to the lungs. Depending on which ingredients are helpful she may be able to use CBD heavy strains which often gives the health benefits without getting high

Oils and topical lotions work great, although a bit harder to dose than typical smoking. Start very small and work your way up, it can be very easy to "overdose" (get too high and have a bad time) with oils.

CBD oil is an option and it doesn't have the same level of feeling high, while still providing some benefit, compared to other methods. It's not totally high-proof, but it's much less impactful than smoking or eating or vaping.

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I’d look in to edibles and start at a quarter dose (2.5 mg). Don’t try to settle on a dose in a day. If they 2.5 doesn’t do enough, try 5 the next go around and so forth and so on.