Please take her to the doctor and see if he recommends probiotics 10, I know some children have taken it, but only
under doctors advise. It is also good for adults better than laxatives. It is very dangerous to be constipated for a long time.
Lord please help this child of your be able to pass their bowels without any problems and her from that constipation for good. I pray in the mighty and merciful of name of Jesus Christ, amen.