I would also suggest that your friend work with a good nutritionist, if he (or she) hasn't already gone that route, as well as seeing an allergist to find out if certain foods are a trigger for this condition. There is a great deal of info & help available, via the internet, on all sorts of digestive conditions.
Generally speaking - Corn, Wheat & Dairy are three of the major culprits to avoid, as much as possible. You could direct her toward a couple of good book resources for more information: Prescription for Nutritional Healing comes to mind, as it covers many conditions & is a great reference guide.
Of course as stated in the threads, stress has a major part to play, as does an imbalance in natural digestive secretions, among other things. Acupuncture can certainly help as can a number of other methods, such as Jin Shin Jyutsu, Reflexology & working the meridians through Shiatsu, Acupressure, & the Trigger Points.
Hope this helps ! Take care & Happy Holidays to you.
The song of the spirit is as the song
of the river, on a journey back to source.