hi, welcome to healthcaremagic forum.
this is the commonest complaint after any abdominal surgery
.usualy such pts are send with stool softners if your mom in not on any stool softners then give her duphalac
syr 30 ml at bed time for 10 days and food with high fibre content eg vegetables,fruits esp dry fruits,wholegrain breaskfast cereals,nuts,beans ,peas etc
hope that it will help your mom regards