My 4 year old niece Lauren is having horrible poop issues. She will hold it for days and refuse to go until it gets to the point where she is curled over on the floor in pain. And its not that her poop is too hard at all, its like she is scared to let it out. She wont let anyone near her to comfort her or anything. My sister has tried giving her fiber and it worked for awhile but not so much anymore. Its become almost a daily thing now and my sister is going crazy seeing her little girl do this to her self

. Has this happened to any of you... or any ideas to get her to poop??