T.H.
my daughter use to have a huge problem with constipation and it was mainly because she would hold it in and bananas! she would go sometimes 5 days with nothing and i know she had to go because i could see her holding it in, this went on for months. it was awful and incredibly stressful when she would scream trying to get it out. 2 things worked for us, the most important was miralax. our doctor suggested it and it worked wonderfully. i don't know how old your daughter is but what finally got ours wanting to sit on the potty and pooh was a hand held dora game that she could only play with when she was trying to go pooh. she was wanting to sit on the potty and pooh in just a couple of days all by herself, we haven't had problems in about 5 or 6 months. good luck!