I'm not surprised she vomited everything they put in her...it can't get through the "normal" way, so her body is getting rid of it the only other way it knows how... They need to stop giving her stuff orally since nothing is going through - that is just making the problem worse (and may lead to intestinal rupture).
Barium for upper/lower GI x-rays turns to cement if not diluted enough with water. They should NOT give her ANYTHING by mouth or feeding tube except small sips of water as often as she can tolerate and keep it down. Water is the only thing I know of that will break up the barium. And it takes a LOT of water to do that.
IMHO, they were crazy to do the barium tests in the first place given her situation...but I digress...
Ok, yes, glandular fever from a viral infection may have caused shock or damage to the vegas nerve that controls gut motility. The good news is, usually viral damage like this does eventually improve (although it may take a long time), and most eventually make a full recovery.
However, given her history of sluggish bowels, there is likely a constitutional issue at play here that was just aggravated by the virus (or whatever the triggering event was)...
Have they considered mitochondrial disorders? Does she have any other symptoms besides gastrointestinal stuff?
RIFE is a type of electromagnetic frequency machine that can be programmed to emit specific frequencies for treating a wide variety of ailments, mostly infection - related (e.g., one common use of RIFE machines is to treat Lyme & parasitic infections; another common use is to treat Cancer).
Acupuncture, homeopathic medicine, reflexology - any or all of these may help. When I took Doxycycline and it shut down my colon, I didn't have a bowel movement for almost 2 months...oh was that horribly painful! Colon hydrotherapy (colonics) really helped me a lot, though I wasn't dealing with a gut full of barium.
I think someone there needs to contact the manufacturer of the barium stuff she was given to find out what (must be safe for a human to ingest) will break it down so it can be eliminated more easily. I know they'll say water, but ask what else - enzymes, EDTA, etc. - something has to work.
My heart goes out to you and your Sister...I have some of the same issues and I hope and pray for a miracle for her.
Edited to add: Check out
www.ostomy.org/supportgroups.shtml to find a support group for Ostomates (people with ostomies).
Feel free to email me anytime (click the envelop under my name on the left)...