My Sister In Rome With Bowel Obstruction Due To Mass

my sister in rome with bowel obstruction due to mass in her sigmoid colon. is there any way they can evacuate her bowels for now and avoid surgery so that she can fly to the states asap for her care? she has not had a bowel movement in 4 days. will a strong does of polyethylene glycol make her stool liquid to pass easy past the mass in her sigmoid colon?