My 11 year old very sensitive DD has peculiar chronic constipation problem.She poops in very small quantities for number of times in day even when she takes 3-4 servings of fruits and two vegetables it's only when a laxative given for 3-4 days completely or prunes or blueberries for same duration is given the volume of poop increases but then it's for much longer times in a day she has to evacuates.This cycle continues for next 3-4 days till supposedly her bowel is clear.Daily activity is deeply disturbed and embarrassing for her therefore.Please help